Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e23476ac3777797…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 19:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24811631747ea897497dbe0beb129e94 SHA-1: 45d189a15b693eeadca0368071c93c4ae392f927 SHA-256: 4e23476ac3777797a50e6f968bb27fb4f346a709daf4b5d7cd648f8e7fb34eb1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to potentially compromised WordPress uploads and other disposable hosting. The document body is heavily obfuscated, but the presence of multiple PDF links and a callback lure heuristic suggests a phishing or scam attempt. No scripts were extracted, limiting further analysis of specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://thevalleytrader.com/files/dinelupumofogesa.pdf In PDF document text
    • https://granitnet.hu/editor_up/xunalovupup.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/bupoxamevabepigesaled.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d2ce55c0b1071c92a4a6ef77d561cb93/mozubepirejupetobitejewu.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/gasemofexikatotakedu.pdfIn PDF document text
    • http://quinta.cl/upload/files/tolajenalitapusol.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cpu942fojgt59rcu4d6ig9m4c2/22585572185.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/33520220775.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/pejifukodedikuzolo.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/gitijadixuxapa.pdfIn PDF document text
    • https://invision.buzyhub.com/files/87761760001.pdfIn PDF document text
    • http://maksimetall.ru/files/67169921989.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/tabepagigaxufafakoraziman.pdfIn PDF document text
    • http://konberdbio.com/upload/files/kebigepapozuxowirobizugik.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///dodusodobesapajabizux.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30713813037.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/56561937514.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/14844429865.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/5623441373.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d08f09688---giforatajojuzagefez.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/wedarulagixolerisujiza.pdfIn PDF document text
    • http://swhos.com/upload/files/37041029665.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/45563195623.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/47209988730.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/39146606453.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/54689270415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gta+5+cheats+money+story+mode+ps4PDF link annotation
    • 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_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 11008 bytes
SHA-256: a88bbd5bfcf53974a0e8c0a5bff1cb92aaad38ecd034845bafbcbb150ab40d47
font_01_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 17824 bytes
SHA-256: 71e4b799487b412f46a17d90b0d4c79becab8a25dd6ac301d7653a845b820f32
font_02_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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