Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b924314bf3e7df0…

MALICIOUS

PDF

82.3 KB Created: 2021-08-14 04:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bed1a19a6024d4b662bfb0aebc19a7f5 SHA-1: d7350f48c3a836628e2543e1e6c14fb620afec67 SHA-256: 1b924314bf3e7df0957ed5657ca022fbd0aaa23e39d4d829a1640e8ce8ea06da
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or exploit delivery mechanism. The presence of multiple unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://unique.global/wp-content/plugins/super-forms/uploads/php/files/fae1da42c52c655a1ab97adb5899511d/ruzanolawapenoxoladukola.pdf In PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/givoa08hp9aditp07llgne5709/davaponazolilu.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/48667008756.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/futuxatunirex.pdfIn PDF document text
    • https://infotechbg.eu/file/fivijufix.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/32806490696.pdfIn PDF document text
    • http://dentherapia.hu/files/file/vitetupuzipofurevoja.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/pixevukeletamex.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/13577777982.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/49454197809.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e1e64dc8---mabinuwovovagonarewevevit.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ee8bm0rh39hbdeh6f8j820acv6/rafudigojawuv.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/t951pq41q71n91avbv35lk993k/bupemegenupujorogelebiro.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/pasuwife.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd09dcf312---94721017834.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/tomiburope.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/2b57bcb5490e0e712a897bb45b957933/basexabiligazojenabomu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c2933ca57---58755353845.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/9194561161.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e83197363---44682309008.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/73611609957.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096668750570---72557839432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=calvin+and+hobbes+comic+booksPDF 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_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 10764 bytes
SHA-256: a0a1f3efb74c55b325de2d270ec1a508afdf21370d72474c170392445965cefe
font_01_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 17276 bytes
SHA-256: 2631feca9485ba2fde63696b707bde631ea38dafafac1c99ab5209002d2865d6

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