Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e465306362cb110…

MALICIOUS

PDF

76.1 KB Created: 2021-08-28 22:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b7c6a1c3c0ad7a9c6ccf437ccd38bfa SHA-1: 8bd0dd97242ce8d50cdf3fdabc50e9fd107761e0 SHA-256: 1e465306362cb110af9459c9275200565b971bdc98eb3379bdd8ff7136a91376
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure point towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=cough+and+sputum PDF link annotation
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c71c3ca46aa---zukezexutiva.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/xepabatagarinakeresoxa.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/24795089156.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/52236144286.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8bc0203c03db861374e539fb2140ee4f/85064546407.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/98278494093.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/nomexagatabowazaj.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/2972869835.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/logiva.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbc90c8217---59536589332.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210615133506.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/53011639035.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803db9f05ce---35264828487.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc18c9170---loverurixurolupejos.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/sevanufivudufefezisog.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/10303989374.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/zikewox.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/tbb5bjj7v27gn1e1hnpgl3enkc/pivitipexenevu.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/watite.pdfIn PDF document text
    • https://qnzar.com/files/63657423787.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/far5k3s7u61cprmvbr95n0c5i3/xuperej.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/20173735939.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_off0000ca25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA25 16052 bytes
SHA-256: 8ce59062bef5b9131577bdf2d380c4b68613836971c332fa9eab709fd4558149
font_01_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 10600 bytes
SHA-256: a4c964d658d9e6223300e108da27a0405bdb5632581789fb1ce1c354aeb15cbc

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