Malicious PDF — malware analysis report

Static analysis result for SHA-256 87aba29da6aef383…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 11:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc1bbeb5939a16f5f0f101fc0e97d3d4 SHA-1: 0a8e213eed246efdd9e819504b5c6341f0584044 SHA-256: 87aba29da6aef383f1deaa063f7255fabee77126a64fab9c183fbac86352f5f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of numerous URLs and the malicious verdict strongly suggest a phishing or malware distribution attempt.

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://detmers-kontejner.hr/files/maxorama.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1851ea96f736ec7365809ca3168a4e83/30780240393.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/31767302941.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/tevipijomiremew.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/59527288806.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/zufexomidika.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/86044595129.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/zeziwitejotolemeke.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/97885940016.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/pafukixowanoza.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/21844557855.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/lexiwenetoxa.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/20658531054.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/14360401622.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd95a1d9a---kujujisotetozozorudomajus.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/65715333161.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/53691230560.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/qh56vt6droo8b716ktag6f79i2/82200311485.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///44926016882.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/pikufe.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/22938786881.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/woxowopedotilogusofogubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=lu+cane+mortal+kombat+moviePDF 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_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 18152 bytes
SHA-256: a7d1cb79ba22bc39959dfad663e449c33554cb52d765681618b24868ff52507c
font_01_sfnt_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CA 10576 bytes
SHA-256: deee6d8981e1f49aaba0877dd74e415cb0a8804fb8b7c97d45a588fb6b8ad012