Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2438bf70f1f2e98…

MALICIOUS

PDF

109.0 KB Created: 2021-07-25 21:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf1074c449bcb54073d79619267216d1 SHA-1: 2ff43c8ac696d1840c4cd19d19780a470209a4a7 SHA-256: c2438bf70f1f2e986bd1cba8f1fb7587e755103a79145f9f08471fd97965747f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristics and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://oncetrabzon.com/resimler/files/fasitovekawanexotoba.pdf In PDF document text
    • http://train-in-japan.com/images/blog//file/98973489828.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/79794725436.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/58100095060.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/18349750382.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/63399429598.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/molenivusojosemek.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/dumexadadujumomeb.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/duxekutop.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160979d575c1b0---27193717829.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a938f85828---77366639581.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/zejorolapegejot.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ee5516138760a3f8447e54a06337e4c0/68800252747.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f84975768482e50f532ac315e594033d/tolededadijem.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/perened.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1qjf2q84kie6ku6qo03olestu0/lagazojusinexatol.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/fexufatoluvizoxesadofatid.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/38884276014.pdfIn PDF document text
    • https://anfauglir.com/images/file/rewijukadefakodovebepos.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b85c90c8bb---wojoduxomukazerovejotovan.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609698685f24a---tejirilawopopafuzebaxawiv.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ojg8tfrb95te9cftqvrm9v62q7/xudojetixa.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/qc5l07oifq15ffenmkevriok4d/rosib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=starbound+weapon+spawn+listPDF 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_off0001418e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418E 19220 bytes
SHA-256: a34b6c282aa9515209625edfc463173b656694dabfb5eefb1dda8f5e11bb0791
font_01_sfnt_off000174fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174FB 10784 bytes
SHA-256: b2e3d4c6914f1e6f11eae1f1dbe20169e4d36ea93cb3f869634f38af40054913
font_02_sfnt_off00018dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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