Malicious PDF — malware analysis report

Static analysis result for SHA-256 40285b93be923440…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 14:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 527a2fac9474f22c994c2d62b2b5d300 SHA-1: 0d853aacfb241b606803efdeb70f8012da562571 SHA-256: 40285b93be923440fc359519da98c29c4c1ac28362380d5099bbb02ea5a0b6b9
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://dp-silver.com/userfiles/file/15380672573.pdf In PDF document text
    • https://menlopark.com/wysiwygfiles/file/vikinanuzej.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/vkjpsi43vsq2serlaf893m9250/zolasomaxotobutoxo.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2ca17cdc731971e51d9a1519d49c79be/bupigimurun.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd98706a60---movotojig.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/roxetopigo.pdfIn PDF document text
    • http://coumert.com/images/file/gonekiroxobazeroras.pdfIn PDF document text
    • http://classtool.info/upload/files/1332021071.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ca240dcf175a46ce84793ae1b5749c1c/36248886505.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/78609780828.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4a032e401---54243036715.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/11024766271.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d579ab429---9807678441.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/vufonorenakopewilegujo.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/zaseranizenama.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/fatagopodewamufet.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/21767812607.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/41903606718.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-25/20210625200110287619.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/48059848246.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/31958439893.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/73088543384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=scapy+manual+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD031 20408 bytes
SHA-256: 47d58a3c021135bf66340f4e2aa4473b1cec3b6ed9da03cf04352d81815a4f0b
font_01_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 10360 bytes
SHA-256: 5f5c7e0a07e6485be586312b401303d778198c4a86b7749ecbcbaed8df7dcb96

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