Malicious PDF — malware analysis report

Static analysis result for SHA-256 959e27e7cc0c2fc3…

MALICIOUS

PDF

94.9 KB Created: 2021-07-18 14:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40139e3c13fe10b0cc0b0b8175915bb7 SHA-1: 72f00773a4c217b208912eeced4333cab014f201 SHA-256: 959e27e7cc0c2fc3c3ef8d35738fbd25904cfcf85e68a34cd1241130673f6a00
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis suggest a malicious document designed to lure users to external sites.

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 http://veiligheidsslot.nl/ckfinder/userfiles/files/jikovonesufabaj.pdf
    • http://montaze.org/democms/userfiles/file/16958833805.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/44924990563.pdf
    • http://ekolojikweb.net/upld/userfiles/file/lisulowolozaramo.pdf
    • http://gostinica-domodedovo.ru/files/metototivopemu.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/64f37tmu549d0kmbb04lgcf9ak/sejikigalekekudefavutum.pdf
    • http://thegioioto.store/upload/files/puvetoxexakerodobabapijum.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ccf5f20b4eb8ed30e487358788324a49/zakejuxufurukipesogifopad.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d3ebbe05f97e987980810fcce47b8fa0/lisoperakarufox.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8f01c4a55---dugelorofugizazosidazoder.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/mawof.pdf
    • http://currycornersugarland.com/admin/images/file/34294868501.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0219b64d65---20627877204.pdf
    • https://micsys.in/userfiles/file/14416046783.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160729ba836d29---19042591919.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a72cadce030a3fb23640a7e4746d62c0/vokopajudupotijajineri.pdf
    • https://cissud.eu/uploads/ck_editor/files/21598439347.pdf
    • http://musorcentrum.hu/files/article/file/darasemiru.pdf
    • https://foundryindia.org/userfiles/file/nugagubofika.pdf
    • http://sarljarry.fr/userfiles/file/61769772243.pdf
    • http://nhs-carpediem.com/clients/46367/File/kiberabagofag.pdf
    • https://acryl-bg.com/userfiles/file/jekojekexerewavebit.pdf
    • https://aslimitada.com/userfiles/file/54430117908.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=5th+month+wedding+anniversary+quotes+for+husband
    • 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_off0001105e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 16792 bytes
font_01_sfnt_off00012870.bin
74b24d73fad33b831e9ee5ae70c3d2315c8761f706745bd1e723be9c2a4fa3ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x12870 16864 bytes
font_02_sfnt_off000153fa.bin
752afc31e235b4ef1519194a0928cfdaf7e15b77f5a7bcc9056553b7355153c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x153FA 11444 bytes