Malicious PDF — malware analysis report

Static analysis result for SHA-256 181e431aa30576bd…

MALICIOUS

PDF

70.5 KB Created: 2021-07-18 15:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 625f54655389f5e99ca895055784307a SHA-1: 0d194d0d7c6e3b5accb0ad43dd7184d8066fa883 SHA-256: 181e431aa30576bdfc94bd324bb46e79e9556665898d2b07c810c4c81c1abb21
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/42d426982c86bd7f423f55a40a2cac2c/tiveti.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2d701ecb6---74058911659.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/10046008980.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/73497050032.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/ba66a024da898cdb090c312c68c3f8c5/sogerusezexonezi.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/vogezoniga.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/46257973671.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/50171087189.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/sjauco748h6p5dvc3cvtg5s00m/87209995101.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/saxozikud.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ba93add44721aa523d456933020dba28/58530054171.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/dunaxelujuxes.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2a9c5e2fc030ec70ee1176246516362e/fetefem.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/k7st9ai7ppp47me0h6qk9irs47/lezixoge.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/wabudusori.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1e71e1a3---89223444465.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7p6nqevo64kttcr0bvldv860c5/91055240663.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/33826761736.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/57285707272.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/04d91b75c24ddea709cc446d45deddbe/rutes.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607373cbf06c0---xivuleronagigakuperipe.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/42f1911ed86aac342233904e5c1f2455/jipebuvopivoxelisavaraw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=wretched+in+the+biblePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB551 16156 bytes
SHA-256: 6cc7884b6e73ff63d1ac02527fe9ecf62fe8bf072aa3e146da81574f467df45f
font_01_sfnt_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 10148 bytes
SHA-256: 2cc4bffac6de16a5cf34a90b12ea4495fbd0302865146d3b5c1fea6a6740260a

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