Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f87597d95f577d…

MALICIOUS

PDF

99.2 KB Created: 2021-07-13 20:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49711268ac6b804e9440861c7e3fd2c3 SHA-1: 5e5708911c2afe5e7940b512971c83deaf6347c5 SHA-256: 32f87597d95f577dfbcb2335dfa94e9c33ac808654d3b05e189a9c5dd963ea60
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/68419244139.pdf In PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/jhig6hajntsp18rm08hetit39o/rezesodixinogur.pdfIn PDF document text
    • http://coffee33.ru/archive/file/92244382835.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8c78165c76d08748f904bb65d13fe956/jululufigimiwokarilarapo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f56f491660---xorod.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160803bcfa5dad---91118060032.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/jugevovabukipilox.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ae5e9659a085804feeb2a05f80e51da2/soxazaj.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/21753948515.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16071634c36899---golimufu.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/15468345165.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/fb55426e9e2498a7365a764b01a52e8e/xukaraletoligasirij.pdfIn PDF document text
    • http://cursosadistanciayonline.com/medios//files/38055165810.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3bcc493414e8e03dc9bb23c45b0f2325/bifamifile.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/dvpk85ha91abtcn4lcmkv022e7/50502497580.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/sotewuludijijotilal.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/98683745546.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe7317432e---kofakegewajafuzon.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/35047215193.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d55b841660c---pupikabuwone.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/obcsos9b1lfsj994to3ih5c447/3089024290.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ieodsunc8g83gi864e358slnb4/nopigelapululexuvafifel.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/55995754507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=line+graph+ielts+with+answersPDF 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_off00012188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12188 10452 bytes
SHA-256: e896913bbe66a68c6b32ad9e1957b569ac5ddaf1c92930805f7169a45a078bdc
font_01_sfnt_off00013937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15149 17668 bytes
SHA-256: 983f5ad357b3174c02bf4f6b69d6823b2b72fa4a6e89d4a06b1acb9a6924b377

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