Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d52ecc1df567b4…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 18:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7852607b0139ae3f8354acee41422e58 SHA-1: 46edb199f9ba41567774884428be5bbd3592bc06 SHA-256: 91d52ecc1df567b4e6ad4f1aa59de8d0451a84bc40c27d0b4953f6cd14c121d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to multiple compromised or disposable hosting sites, a common tactic for distributing malware or phishing lures. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The document body is unreadable, but the heuristics and URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://sarkar.ie/userfiles/file/88553470268.pdf In PDF document text
    • http://veganogle.es/uploads/ckfinder/files/visumekegeker.pdfIn PDF document text
    • https://ocw.tw/uploads/files/35009534212.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/75e6a9a163912b1fbb838b286d623174/funametupeli.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/juwuwuwebuxedaloramutu.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/demexagezojelano.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/53205602579.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/86729555837.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/23243047965.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/meroxevegibise.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6b04f87d---30335730693.pdfIn PDF document text
    • http://terrietanaka.com/library/files/19132540936.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/josunosafo.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/10175086089.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/sozoloxarudiwudosugeze.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/paniwovimazelugar.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/68871730494.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/98095670936.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/3406849821.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/dumazebazopulugijel.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/xezajumu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/189d1457b030669d190aa9932e7e0e31/16912279650.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/176d52e0ce7959252cd6074b551f7265/85416146465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=roblox+ultimate+tower+defense+codesPDF 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_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 11112 bytes
SHA-256: dccb7aef69cdb6b3c922774ded09dd3b4628e1143da6ee68a3a8a67220ccaa92
font_01_sfnt_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 17184 bytes
SHA-256: 94071756f4d87316ae32381cf7ba54c24d445f475ba9920ca3749c13fb7aa11a

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