Malicious PDF — malware analysis report

Static analysis result for SHA-256 6770b229fc1c44d9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 17:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bf2f526f228393a83b973cb50735eb3e SHA-1: 31983e0d3c0173179beabcecd101de79a6e66c7f SHA-256: 6770b229fc1c44d9da06710927bbe9517f7ffb9e0929d13bbfcb52bb91d8b81f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malware or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://lynxitservices.com/ckfinder/userfiles/files/15980141683.pdf In PDF document text
    • http://tochuchoinghi.org/files/80142319510.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb4ff332d0---70337929390.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/bavivowuzurebibe.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/41767847529.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/32408057632.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/65104563618.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/sudosoxawadoloduremo.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/febaxumi.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/ruzupetulowupezimozomu.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/tiwivutewomepoxazexug.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/34797172573.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/zisiw.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/tejunefizanidulumokilowa.pdfIn PDF document text
    • http://castel.lu/userfiles/files/kuraxesabutarupiju.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b57d1a9984---vedamekone.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/pvevrun35fg1do4uo87vvabp35/92820358225.pdfIn PDF document text
    • http://savemaxint.com/files/file/zokatuvunaxubinudimasidip.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e7d1a4cc---rujotogisebufoliniwod.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/nusubavanokaxetube.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613802df01bdc---89687434538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+ld+player+for+windows+7+32+bitPDF 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_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 11172 bytes
SHA-256: f8ddb02091810de1ac7caaa36ab626c60780304ab67a90746640c08a1edbae76
font_01_sfnt_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 16824 bytes
SHA-256: 7d489674b3b00aad0402b62b7e9781bd79189fc979c0c901e2e8a0c975ded43a