Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff40fd3789afc70…

MALICIOUS

PDF

102.0 KB Created: 2021-07-03 08:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 738c0e4b1acb3ff544c22fe3ca7311b2 SHA-1: b9184d993e434b7284c91304f373b1140c075862 SHA-256: 8ff40fd3789afc704fa9dae3cd4557c3c5fab081d5647049c7e2caaa2f9b839c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised websites. The PDF contains numerous URLs hosted on various domains, many of which appear to be compromised WordPress installations. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c39d05a67ce---rosezawagosol.pdf In PDF document text
    • http://rmgoals.com/userfiles/files/11565569230.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086642a67ebc---22139123743.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e5e30321---14240019297.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/7578239886.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/49873165158.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1c26a7d4f---42119609970.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e4d82274---zazugogogesewej.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/32309403382.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeff2e339d3---kuxotusixomusijexaxodu.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/lamevifog.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6986569f67---lopemiwanuvexi.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/mazaramoneronanixizizi.pdfIn PDF document text
    • http://slsnn.ru/content/file/luguxosamifigibijukamuxid.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0b60a559481119ba387b2b9d70fd2ce1/34133118157.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/29a393a44b43739ce3ac3e6cee8d144e/4825367828.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/bfc3ba173a4bfdb3253875029c94a0a1/terivewuja.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/97517052903.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76194c89df---45596919803.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/66627241793.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d41c5157059---67562665692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=enthalpy+of+formation+from+enthalpy+of+combustionPDF link annotation
    • https://mediaget.com/userfiles/files/tekidejometojixatotebodun.pdfIn PDF document text
    • 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_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 17956 bytes
SHA-256: c22ca17e8a8140f44b367b9e5d098e117a3df05a8ac3b41816512eee8c633ebb
font_01_sfnt_off00015710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15710 11084 bytes
SHA-256: 877d50d5b16a42d12d6c2c575a722b36aa719bb0b92137186376e4bd0c251bcf
font_02_sfnt_off0001707c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1707C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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