Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efda5c59de999db…

MALICIOUS

PDF

83.7 KB Created: 2021-06-25 00:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7646b1d421867d90a6e5a3c28a1c7a1c SHA-1: 9364e3b4f9dba5c242d3bf6ffc1e2cc7219014a4 SHA-256: 5efda5c59de999db969c0001453a2428c2b6ed69ee75abd3931426215e59bb24
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a deceptive lure related to templates.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cahayaapi1.com/contents//files/lijanunetox.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074a1494f697---tuxagisiwatizelevisu.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/bigigufunisoku.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/97645597445.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a1a5948605ef7ff47462680a5234aeba/1221068099.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/740d53193b32a3dbb0930908b8aa25a0/ludixavipuwapadurelipoj.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608888f716144---20263647578.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc61282b3---jejam.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/21aab213d0226561c7ed614f04d8b593/xawiwelomupetaluxovaxoral.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0befca7335---vabomarebuvikupojonipitox.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/5720024553.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/irpnr6pjloo7e5g35m91jb2f3g/vevapokedananarukinudem.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa9716050---vegekotimoxoveguwev.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/mukitagixinizomoj.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/20311202888.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608839ccddf56---47027915355.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/vvtrcoi44c8e15hubabsp8568t/97996853785.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=word+template+meal+plannerPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 4680 bytes
SHA-256: a8f5cf121531b1c0d11a357005a243ea318b20368c2a1638bdf178aea2dd6004
font_01_sfnt_off0001061c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00010eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 10832 bytes
SHA-256: b0616101789c335dcaacc599cd2f9ab52cef353d9a0428ffb63d1388abed4603
font_03_sfnt_off00013336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13336 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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