Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1d6644c3707977…

MALICIOUS

PDF

96.0 KB Created: 2021-08-17 23:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 659e49a8f0744cab9a14aaae836bbc0a SHA-1: 37770c941784e9c8744aad3cfc6be4489376478f SHA-256: 2f1d6644c3707977b9f1bf26b96752ddfb53c8041ff8d720d62c1d56dc46941a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.awakohchang.com/image/upload/File/ozolabeguwegofujut.pdf In PDF document text
    • http://popnmusic.fr/userfiles/file/lufimixo.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/30436538929.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/pifiwibodivejolon.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/91302525601.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/418cb4b8faa1f946d3623cc4faba1880/16032442172.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88e7492fe1---junof.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/38696690762.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/40846439314.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a962dcee1f---94285717308.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/jazupazazirusuwod.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d734f1b71---88502440558.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/kekeneminadopilet.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/56610869827.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/85537140771.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f31d5e477420065b7d21ee8448848a0b/40833441353.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/66376944582.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f54f2d957---rajakezexonimerizosimerep.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/42872841241.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e7ace9c68afedd974090a5482ea97dbb/fanas.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/70801013225.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/wumagobododa.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d5cafce6---namekaxasinalobamo.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7b3eaca4cc6f2435a4838e4a7aa706db/mezelane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+gba+rom+hacks+top+10PDF 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_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 17372 bytes
SHA-256: 49fbdaa9509c09decfe230cdc2cfb4d4fb50ee6056f7c5bd498c1d16791c8b86
font_01_sfnt_off00014050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14050 11088 bytes
SHA-256: 37e8fac2df401279596a984d0f0718abdeeb16260b8e4c13eff82c17300a2124
font_02_sfnt_off000159de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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