Malicious PDF — malware analysis report

Static analysis result for SHA-256 35068a9c4bf935d6…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 02:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6eb8414bb65653d9847a92301fd34a96 SHA-1: 47dcca7f40578ef9824416fc87449b098530c792 SHA-256: 35068a9c4bf935d6dc0dccb58e12fe52090dfcbbc683e67bf03f70f6c645eafc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of multiple external URIs, including one pointing to a raw IP address, further supports this. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=parking+penalty+charge PDF link annotation
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/6e0d2e346e425db24d2ec44c68e6e3df/8311274247.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/33370525356.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a288689cbf8---toniwafi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1ee7510fd7789a02e29989004b22fdee/rezogewamisu.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/30699819560f52892a762c.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d346fb1cb98165ccc75262a3b4d12d91/54602869783.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/413912d5bd3cda8712d195fcb8e9a787/tidunitinugud.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4abd7cc19---6924628214.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/49983186002.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/95956855481.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160e434b074f89---90063273284.pdfIn PDF document text
    • http://coffee33.ru/archive/file/98826260233.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/13641415028.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d01f2b77dc44665f9f7bcfe45a3561c4/bawojefosepodibumejupo.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9699f6f6ab---65580516330.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1610432dfd89d9---fimaponowoz.pdfPDF link annotation
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/67007699471.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/54504447465.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/motelekejaradegupenuvalud.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/semojuroweraxasudi.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/vilifawafazomojola.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a624950fdb2a1331134e5b5ae80089a8/72793626047.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e79d539a---10119779596.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb0aaa588---16057793160.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9789f8703f---33308477479.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/79152064168.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E9 16804 bytes
SHA-256: 5c34be5306fe52fe80d98a14e688f7134fa4413714ccaaf91e7c2d3a54cd845d
font_01_sfnt_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 10572 bytes
SHA-256: c6de480f58701051d086aae2ca9143a19e98ff5f805523f7302e614b74ed5d89

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