Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c89a4f63a47156…

MALICIOUS

PDF

83.5 KB Created: 2021-07-10 06:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 768f9364a4541220e3ffc8c831af8c8f SHA-1: 7d242f020dbc5aca3237cc4f374f3d44efb69171 SHA-256: 85c89a4f63a47156e684442da9bda4ec7a32e2dd2b4cdd399961c1e57ca24597
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature. The primary attack pattern involves luring users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://www.annaleehuber.com/content_files/file/mowag.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072063e806df---56406499669.pdf
    • http://fedoro.ru/upload/file/97639959103.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2af1d0ce---24763362628.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/ef106110ab31a3d10b93eddce63d6a54/50044247779.pdf
    • https://stcc-sa.com/motakamel/Ups/files/73477803836.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8feec4896f---gubozejivujuditu.pdf
    • https://nuttydog.hu/ckfinder/userfiles/files/96444506718.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/tv2ir52ercjp926tcb5ovl1e00/tosisewokamexokej.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab4b278d48---rozegofufus.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/0859kg8fo1nolpt1g39krog5li/lovedegikoditojobudufori.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vkubb21t86hkscvneigrne1pdu/12785389163.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e326c645056167e0867fb0561f7f0c82/sanofesufofol.pdf
    • http://www.tokyomagic.jp/images/library/File/34411138270.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160919010671ae---zorewagotefomoz.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c7ccfc4bdf91d34071f6cc746409fb52/nixupuw.pdf
    • http://stevis.cz/files/file/74575472218.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cb67d6d74---81284067191.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/797no9oq9hhgrid8emkk5o8moc/69251483176.pdf
    • http://csc0351.com/userfiles/file/20210704221006_bmv1ix.pdf
    • http://grupposcorcia.it/userfiles/files/46710870686.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a0829b76a97d4e3e2fa9e6e13fefc5ca/pupolaveropadatu.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/vipofomederodudepirugam.pdf
    • https://himalayanthailand.com/image/upload/File/52105414191.pdf
    • https://gamaconsultores.cl/upload/file/96057653183.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ee34c5a7c810065e3b8dae8865d80b23/22831137378.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=behold+the+dreamers+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_off0000e389.bin
8571822f15285e3a4db42da62430e60a19bc8eb5ecbc9c18eb9b4f1cbbdce613
pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 17100 bytes
font_01_sfnt_off00011032.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 16792 bytes
font_02_sfnt_off00012849.bin
643a91230fcd6abe0f240e73d93cca1b88a90e6177d6f59efec5d5ee30ed94c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12849 10620 bytes