Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17c02a0c03ff667…

MALICIOUS

PDF

67.1 KB Created: 2021-09-05 02:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ec8ffec19e05bccc65be6f163d851a5 SHA-1: 90ba95f5670a12c4862d98836999112fa48e6437 SHA-256: a17c02a0c03ff6672d9b53b3b3315bc6b71baeb05e60dc1bc869fc5e85ccc60c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to external websites, many of which appear to be hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential for embedding malicious JavaScript or exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://lumieretvie.com/userfiles/file/fotirozakumadebifademi.pdf In PDF document text
    • https://kultmotor.hu/images/files/pozisu.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/94d403e8a28d5b253ed0151aa882fa9f/90426033290.pdfIn PDF document text
    • http://mav-auto.ru/images/file/17915522293.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/3884gebhjn2efos5635vt042b0/98603884760.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/58238604188.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/afcb646ca5bcf07577ec438ac287e4ad/77595870.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/910235d21dea278bf6b8573bd16afdf3/69542708267.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54bc9ee9ec---musuw.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/miravapizanuduvavuromixux.pdfIn PDF document text
    • https://blogsma.com/files/47913556302.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/tofanusam.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/wiputu.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/50995705062.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/dabogo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d6531d7fa249782d9b304f55f8b549b1/21222852481.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/nemoperek.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b85e7d07afa---jexezuvarod.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/nugikiposotenojazumekab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=circutor+wibeee+manualPDF 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_off0000abe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABE8 14268 bytes
SHA-256: 956b6d61449de2fe8122476f134cb112655bb4e06ee67f28da184a2090abc15d
font_01_sfnt_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 10580 bytes
SHA-256: 4e3097c19864327f3248a7ffc6aa4a6e35a452145b5cc40c78c3fc2c30e6d262