Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c342cd4481e3e1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 12:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 227ff5a4b3ecc99cff03bb8ad63a54ea SHA-1: a5f57ba8d53c44b44d1892cf71a1f556b0d66aab SHA-256: a2c342cd4481e3e1951b45ec852afb85f702a30050ce2c4cdbf83ae5edb3d55e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gostinica-domodedovo.ru/files/86783359090.pdf In PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/rekog.pdfIn PDF document text
    • https://partetesal.ir/data/file/buviwoxitewit.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/72207063666.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/lazutibudebe.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/norizetukoroja.pdfIn PDF document text
    • http://8njl.com/userfiles/files/26645918941.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/jebigizasifofoxuj.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/99820009267.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/buvupumebigukonad.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/vumitepivelupunoxulinap.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///gogomego.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090410570356.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/64135140695.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/16988555423.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/10026907596.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161384f91312e3---35372201830.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/vozidaxebemix.pdfIn PDF document text
    • http://lachina.cn/upload/file/4510678403.pdfIn PDF document text
    • http://quinta.cl/upload/files/20544925906.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/40317563667.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/557378a0ac76387b600f84ee5a0f53aa/joviwexipuxifelodizawazov.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3272b717222d2423d102f342a352632b/bofugeruriwina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+change+storage+from+sd+card+to+phonePDF 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_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 17756 bytes
SHA-256: 77356e65dbcc27c7ca0335556a03021fedd4a921bd7e72aa99c62f4c718eff4a
font_01_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 11008 bytes
SHA-256: f164ba6090a2b1178efa0096ea76dd58ef0becea7e3b6ae7277d681cb36f1e19
font_02_sfnt_off00012157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1