Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2d56b940f79f38…

MALICIOUS

PDF

107.7 KB Created: 2021-06-07 04:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2ad9ffca088a2dd5c013933dc1f010de SHA-1: d896dea0b3f8c76e6f638f1aca9a55f75b62247d SHA-256: ae2d56b940f79f383c28d06dd3f7cccd8c2c11c65d186b481c0a533414329b49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded content, though obfuscated, indicates a lure related to 'self-discipline with food', likely a pretext to drive traffic to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9603

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crewmak.ru/uplcv?utm_term=how+to+be+self+disciplined+with+food PDF link annotation
    • http://interwork.sk/userfiles/file/66561522356.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac23c228f5b---pezatowowosozewun.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42da378ae7---1237813423.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/d8jraauol4k06rieptv1482gp5/rafonezavemuz.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2sp576jb67o1fpo50p5se403g2/14894245635.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/12690519469.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b32e3b91b4601a1b9eec4e3fd4e91e57/lapavek.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/98562136176.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/zimababege.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9b6ifin38u53u5hmpvk93lsci3/17923343382.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/robaridapibuzix.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/717fc251bc7e454e659803f192b5f24c/weralimalitipo.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/mojiwutiminagoba.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16097c903181d0---runudon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17321 5128 bytes
SHA-256: c9b82b286b675cac76b0de9b21221714a8843fccdddca4e5228c8c9212143dc2
font_01_sfnt_off000184a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184A2 11644 bytes
SHA-256: 006930d79da4ae63f6018cefb02ed53658bf26291617d36f7cd5cbe2dda6b2d6

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