Malicious PDF — malware analysis report

Static analysis result for SHA-256 8697650f27491873…

MALICIOUS

PDF

106.8 KB Created: 2021-07-05 13:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cf35e56815e5241e4bb440b5cc88ea93 SHA-1: 037d762f75a12559b0a434ab97d88f99034ca03d SHA-256: 8697650f27491873a5553cba93f9ec6c7ae1d31eb81ce4738adf5eaa37bb5585
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/a2141f8d1e88809bc9ec3d28a7227c2a/jazezizawugun.pdf In PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/icne03b7cidga2bbv0je2lc0at/fenuvixulafudajotupokavi.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/xarajovivuwo.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/15401733777.pdfIn PDF document text
    • https://egca.fr/userfiles/file/safomavamabitezimalun.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/48314743700.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/tipeminewozew.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85efa83c5e---18477949779.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/62810279493.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a3f98f3b3---digedegakoze.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc8537531---dusajamarevudokusu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc520e62210---momipofimegare.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b14a161e0f3---fogelikunifaxisuxulisu.pdfIn PDF document text
    • https://asiahijau.com/contents//files/31418543910.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/bb2oeqjk86jvbkfppvk8muk8n8/vajikow.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/rixadiza.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b293090bd3a---86428161125.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/92336135745.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/20337650244.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/25fd89fc4202fc1411cfece9411d8c6c/vezalite.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/40271884212.pdfIn PDF document text
    • http://turnyras.lt/Files/file/buriwurifipalixo.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/8650888664.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079689a5e340---xesufarorar.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/wozowejumezeredisunub.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cec411b34d4b28708792eadec457211e/zitekuletogavub.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a931a065948---4054934987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pakistani+society+and+culture+book+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00013b58.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13B58 17732 bytes
SHA-256: eb8daf03eae306fa2fc4ee05e797a4f5b567b44b4e095da435f4713baa6d01c7
font_00_sfnt_off00012347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001568a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1568A 17348 bytes
SHA-256: ee8dc1549a3049085300ecb6d2af32ebf8ddcdebbd0cfa1625329d54d0d5964e
font_03_sfnt_off00018341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18341 11060 bytes
SHA-256: b932a4ac225c2231296fd6c4b857b797f33081c45d2c61e2876f066c0389dc5e