Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed6dcc27412dee4…

MALICIOUS

PDF

125.5 KB Created: 2021-07-26 21:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3900f3549386fc58e87738a6b88b9a4b SHA-1: c8130b63e535db0de356abbe11720c159f542bfe SHA-256: aed6dcc27412dee46057b1773e79b6049e16446439cfa1dff3dafe9d26e1be7f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress upload directories and other disposable hosting sites, indicating it functions as a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities. The embedded URLs and link farm structure point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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://ccforum.kr/uploads/file/1624177868.pdf In PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1533bf10ed---bugonekevo.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/sironojanudux.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a530490bac9---wisix.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210614092114.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f80844e262---32207777505.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a19ccba9bb8553846d7f1867766f8308/nenimitopexasadafaf.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b606cc97053---wixumiwozupululabojokevix.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/solepo.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/56266911577.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/73691489667.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/sufadaseresitutitixevev.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a6dd51a7---72037495686.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ab9b97ff0---51928419800.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60c014c90f2bb.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/96348530762.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/jisuxunupevu.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/42612834683.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/mevazovixuj.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d774e3ac4b3---59859948520.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085056a218fc---66390919283.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/06e435a59580f84a144bca0834e46fa3/93917177183.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/2931f63d3b9ba98e45c37259566af39a/20462109478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=descriptive+words+for+animal+soundsPDF 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
font_00_sfnt_off0001799c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1799C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000191ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191AE 18664 bytes
SHA-256: 592a2c9251ff15a275054f7d34928b31604ee22fba549d8b45c2bf9f762428ea
font_02_sfnt_off0001c2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2C3 1704 bytes
SHA-256: b000ba784e06dfed05e5036781705fc03053f75fb86b6431fcd8f8bc5d31227b
font_03_sfnt_off0001cad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAD5 11036 bytes
SHA-256: 2ac288a76057bf29a9421035bd5ab50006fc052f1866ef919299d76e75c9864f

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