Malicious PDF — malware analysis report

Static analysis result for SHA-256 2760826d4e2a8855…

MALICIOUS

PDF

104.0 KB Created: 2021-07-23 05:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c6e57276cac5f9be07ed33a1f4b36a1 SHA-1: e1a1ae552b91fd430a176ed09719761c9178faba SHA-256: 2760826d4e2a88557dee17d09546997c9134b0c71eb76dbff1bb867c9ce64a01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest an attempt to exploit users via malicious links, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b465d42e0d6---65627933736.pdf
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/watixeku.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/8087158182.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9545d2127e802133118e9d93fb90e55f/19047018321.pdf
    • https://derey.nl/app/webroot/files/userfiles/files/pigobamixeneninulilakexij.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/tuburatawobibumiju.pdf
    • https://alshaabcoop.com/userfiles/file/talonugoma.pdf
    • http://mediedil.eu/userfiles/files/dagamozawididasowubozu.pdf
    • http://kaitosushisb.com/uploads/files/votogemonixumosunor.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3bf41d90078dfdb916214f6d90b57532/debik.pdf
    • http://hum-lucknow.org/test/fckeditor/file/64316337486.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc78a89940---derifuxirali.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/08a2041def39af2431d53aa12b99c332/doguveleninuzufaxonujad.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/149744ee9be28464a3198dec84e11167/51780082613.pdf
    • http://scamps.biz/userfiles/file/53735826051.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0b539e195a4d6647113cf67f0123b627/pagamiwiwuvezu.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/652811e016893edd51e2930ac0304502/54285663519.pdf
    • http://amadpich.com/userfiles/file/galonesovu.pdf
    • https://arrayamed.com/userfiles/file/genobekedalanavadigututon.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e86b2d0496---xidazazirilatotaxebapokek.pdf
    • http://navakarenterprises.com/userfiles/file/jerijoparumafavif.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ff1044864---51521031921.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abd5f7ce4e---wosovabovegerolonebipi.pdf
    • https://cmetrix.net/ckfinder/userfiles/files/resonajevo.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095c59b7f763---86307378497.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=rf+mems+theory+design+and+technology+pdf
    • 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_off00012f75.bin
05d31ef87cac7015153fdf6c1c58ce39008492068af009b023f33eb78fb83789
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 18224 bytes
font_01_sfnt_off00015f80.bin
d3f9ff87cd7d6309219840084379b285430e89b312072aa840a2edd2ef497864
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F80 11228 bytes
font_02_sfnt_off00017974.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17974 16792 bytes