Malicious PDF — malware analysis report

Static analysis result for SHA-256 361f27c4b0e2243c…

MALICIOUS

PDF

94.1 KB Created: 2021-06-26 00:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a5a413752d5d9076f7eb0c762a5d586 SHA-1: d1399bfb59596bfc9ecee7376194f21a9cb888bf SHA-256: 361f27c4b0e2243cf1949326dffad4493774f60d17ce4b7226a7ea9e3abedf39
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

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://alihuata.com/userfiles/file/jidogeveka.pdf
    • http://hagelkonzept.de/userfiles/file/22140089863.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a869aa4e58e---latujekonegasuxezumine.pdf
    • http://fatamorgana.fr/uploads/assets/file/37684147442.pdf
    • http://amirafouad.com/uploaded_files/file/88777336893.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210612183157.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/35fac841bf838a156d5fc2cab7531a63/zimaxosipusujoteku.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4rnumekm7c2ihurcfh2fc53qu5/sizejisirobaveliwato.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcdfc51d6d---30030334464.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c435f15bfee---vipidudapizas.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/ziwakejezulizir.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/mi02l7s2i9d8os7l6lhm89u5s7/28543701058.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/43057277741.pdf
    • http://www.puhito.hu/uploads/31653877087.pdf
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/xiperaku.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a18088a6819333538717c7a937c41199/65930108519.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/20525400535.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3951aa6c7---dutevevidobal.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/76e3174bd0e74cd82833e0794da1f94e/78048603557.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/3470673be234aa78b149af4b797fda02/31030413594.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe2c56e42b---kulegilenazugirapuxi.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/42d93f3bf6deecfb73b128129f5c7984/lulaselul.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/8betr67drfftnqcd6p4e7e622n/21863238610.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=meaning+of+the+word+unanimous
    • 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_off00010c84.bin
2c9016ced6ed106f3a47a696e1c2e5d7a1c54ef199de36d31cf4357e23edb2e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 10936 bytes
font_01_sfnt_off00012585.bin
566c2a9bae02403296f3a79d908389da1bdb5ead7af099a9d7cf1e95bd55163c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12585 17684 bytes
font_02_sfnt_off00015348.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15348 16792 bytes