Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca243dfb2f82645…

MALICIOUS

PDF

91.4 KB Created: 2021-06-30 21:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66d20cb464945daa6d5b64d43e8ace37 SHA-1: 5e4c50b9a45fc92018a457ef483a268a9af6f840 SHA-256: aca243dfb2f8264537a87e306ffb37608c6e8650d924d7456084a5ef4c33d2c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3fb0078da---2065626950.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c9395ce34---basifekuxunirizabolig.pdf
    • http://fipjp.com/userfiles/file/35792145764.pdf
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/ce7ec20658ed9e97c2e74eeafc449771/95919631400.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608764ef49939---67248805866.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160787a1faee09---jazofokinerelenusotogex.pdf
    • http://xboxheerlen.nl/userfiles/file/8932167369.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/f783b046c66b6652c3260ceb9cae1712/loviribari.pdf
    • http://tragadsonisurat.com/ckfinder/userfiles/files/nigakividixasuv.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5da6bec09e08352550829c75b7d6f4c1/84924333154.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/tiqlpkepce7u97u91ot4fetjk1/25411494280.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d982114d827d314fd0186505f43e9d7f/15995116522.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/on2s1uqcenhpdk14lrolo6810j/rexemeru.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5e0e81e23---26533476021.pdf
    • http://temple.mo/userfiles/file/21140431052.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2ce2982f0---37178026677.pdf
    • http://piemonteforyou.it/userfiles/file/junitojidesebiza.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/10f7cf87741b870899234d07b478793c/18420316384.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/zezutedozefonosiwimod.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608186a119a5e---88257609477.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab608e22146---zifafazirotejefid.pdf
    • https://ikitellirezistans.com/upload/files/welukafifigub.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/0e2ddd7d9a6c47da3fd84813b1ab68f1/3050923397.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=boil+chicken+breast+time
    • 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_off000102ac.bin
130994915b91bd7b83785611a5a8331dcd80353f4d8e84b9923625f4a1d5db0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 10780 bytes
font_01_sfnt_off00011b54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 16792 bytes
font_02_sfnt_off00013366.bin
5fbd7d08b82cd027938f2b70f205c0984736de862ef22e81f414352940145abe
pdf-font-stream PDF embedded font (sfnt) at offset 0x13366 17408 bytes