Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d7ae8e414c23db…

MALICIOUS

PDF

112.4 KB Created: 2021-06-30 08:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 87cd2e8707d5de0d2d082f02c9f7712e SHA-1: 26489804544dfe2f6b595ac1949aea323940d1ac SHA-256: 90d7ae8e414c23db1ccdaec01e7e14b9880431877501061f0d9074961c78e29e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites, many of which host other PDF files. This behavior is indicative of a link farm, potentially used for SEO poisoning or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, aligning with a phishing or content distribution attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607302e086d58---deligovafagazafo.pdf In PDF document text
    • http://nowyhotelik.pl/userfiles/file/xawefabemuzolisotupolax.pdfIn PDF document text
    • https://digireg.nu/upload/48387515988.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99a8c1615---mojasikonawavudaxudopun.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fb27568a1eb81f3337c84e0b692c68f4/19258004493.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/38bafddf110fc90b0132689f13e6f18b/dubazisuvipuvurelexeko.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/90990049630.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3544b248b---bizunapalogeg.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/fb84fbb451898573f4ecf7fb4c7d1cf9/21026717707.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/1306dd68eea211c8e072ab787e855c6e/topeda.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/68606457688.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944fadb2270---midudonugabilekemo.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/42943818764.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/17533882323.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3f3916922b853ed3cc8a1498f06c6af7/82638595722.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0d587b007---3750425380.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d0881625---90110907029.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607674fdaf414---61799761531.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/40444133161.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff9f4d861---23349277723.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/bj1tqivn4lllplo72ksrfo83vq/ravanikunikoniz.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1b6d018f---buvorodenore.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/50974030778.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/bb12698efae09a18d29ac4935db495fc/95187640666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ielts+speaking+latest+questions+and+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_off0001558b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1558B 17276 bytes
SHA-256: eb3afe4f36ded210630fe9be30b77820f2f85eedb3839a9c6ffa625de3a881d8
font_01_sfnt_off0001828b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1828B 10940 bytes
SHA-256: c7b731c6aad4500071e83e5d7c2685ed4f524ca68afb8a8403238e3673c02daf
font_02_sfnt_off00019b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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