Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c428136115141c6…

MALICIOUS

PDF

119.1 KB Created: 2021-07-16 07:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 537f13b7f7b8af1293bcbd517747c998 SHA-1: 210c82229fc4a632412896c18afc0f08ac2c1042 SHA-256: 0c428136115141c6ae10f211ab8a31a6d80d613832a2fbd26d20de4e4a84ba6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=almighty+god+we+thank+you PDF link annotation
    • https://giga-tronics.com/userfiles/files/dufaganidemapav.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc4f6ec87---18674833738.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/cfe9866f5c45e25e345172543fa3207b/80745494376.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/73925419756.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/69811775503.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16073d01cab11f---mewemetodapusobufomemurap.pdfIn PDF document text
    • http://aweibel.com/Photo/file/pevivivufebogijax.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bac6b6ea419---87745696602.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c916cc0f9---vadezimi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e77c4bf3c4c---kuniroperedejasaji.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/tozodidivam.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/rujowepusivojigagezotizo.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3921352e233a783db10d8e8d2e6b9c3e/63137351977.pdfIn PDF document text
    • http://moristas.com/userfiles/files/merizolusazateverarivexe.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa2150324---lunuxepejopo.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/94972519075.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/vomikimar.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4283bd9a11---gufeborezijowuz.pdfIn PDF document text
    • http://metall-press.ru/files/dozakobefibis.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/fatubat.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad671892dc9---89875048106.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31bcfdb9ab---86305467015.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/50665857619.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/fedovalilumisinibonoveg.pdfIn PDF document text
    • 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_off00017392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17392 16528 bytes
SHA-256: ca032704c42cd1bb9dbfcdcc008c20f12461e25a5114406cc8f5258ebe0c3e04
font_01_sfnt_off00019e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B641 10800 bytes
SHA-256: 52169167a3a198e6abc0fbdb5ccccd3e33209a05967e7ffcdbd6248d682db678

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