Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcb07b05a22f085…

MALICIOUS

PDF

86.7 KB Created: 2021-07-15 18:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0af7a35d13045e540ecd550f2f9b2e3f SHA-1: 9d52682e8f7092a652f3ebba1bb87af3c3261549 SHA-256: abcb07b05a22f085b0ac4caaabd1c2639eff5bedff3140fb64e5e07c9b282dd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=cutepdf+android+app
    • http://shuswapladystriders.ca/userfiles/file/wokise.pdf
    • http://accessprecision.com/userfiles/file/nebesakenakakefux.pdf
    • https://bselink.com/userfiles/file/2871702087.pdf
    • https://luyenthitoeic.info/userfiles/file/tuxasibadumekegoxa.pdf
    • https://asthasupermarket.com/userfiles/file/12883775365.pdf
    • https://scriptdd.com/_file/file/85062496430.pdf
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/5288e47697cd78f9796a05311c074275/wujuzaluvavozukux.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97fc688838---vodepezu.pdf
    • http://blackivy.pl/userfiles/file/pitawonese.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae048c699---48584124608.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16075bbfdb5fb4---gozubibireg.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c35ae6d6c8---64703887440.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b66d0275cdd---71684245360.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ocp4h0b8ejblonngkt18ghqssp/57670156421.pdf
    • https://larioenergy.net/uploads/file/gesekobu.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/doj6fejlc5a67phl37sca7vrh6/fopogunilepebigibovu.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k4sueqm7i80flea5mv71l0dud6/71814217080.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160803afc5c778---tidafozeled.pdf
    • https://gangwontaxi.com/FileData/ckfinder/files/20210626_F1DC9CF60E55EEBE.pdf
    • http://red-persimmons.com/upfiles/editor/files/govikomivoma.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608535af49fc9---rarev.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/6d4c78ef27af2cbd2e7c21561fc0dc48/3949448777.pdf
    • https://agentcctv.com/userfiles/file/migaju.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/j484mrtkkujke2tj1hps189inp/nawobejagowubaw.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/7425a54a7263b07389237db7c5f80f5a/60001462801.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f4.bin
5fee8ae54b1d31d7ed8c83e1102c6656b7666b81935d53d8c2f255711bd32dab
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 10408 bytes
font_01_sfnt_off000108a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 16792 bytes
font_02_sfnt_off000120ba.bin
bba8499f1e196f1a6b6e70997e3fb325028cb303a94a9adad384595ffef676c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 17332 bytes