Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0fbaa905b73b1c9…

MALICIOUS

PDF

134.6 KB Created: 2021-09-21 04:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 92686b74496b0f476f09b0dbf83d51dc SHA-1: a42db80face7e2ada8054724b414207921ea9278 SHA-256: f0fbaa905b73b1c92c92947d9465aaf854e9949a5643221b1457170fd6840803
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic firings indicate the PDF is a link farm designed to redirect users, likely to a malicious site for further exploitation or phishing. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7326

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=pilgrim%27s+progress+free+pdf PDF link annotation
    • http://feg.vn/uploads/files/41551993805.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/mamufexanozoz.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/70456009450.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cac185720b---75490121949.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/24082145944.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/98329683882.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/dagibegal.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/70759477411.pdfIn PDF document text
    • http://minipit.com/data/files/kisepi.pdfIn PDF document text
    • https://webrobogo.hu/kepek/24810475768.pdfIn PDF document text
    • http://kaies.net/upfiles/file/1616492765.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/durisarojemewiz.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/72692879490.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/11584564444.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/88514752749.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/84126216976.pdfIn PDF document text
    • https://mapithanhcong.com/upload/ck/files/25922049604.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/344ef393fe57d429eb2573d030c541e1/ruzebi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0476364a76466d7a78d508c546977096/82937449051.pdfIn PDF document text
    • http://classtool.info/upload/files/zorodomivelusi.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d866150a6c---zafolidotonakaguduner.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/dubelesovosufoxupid.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/wabetopupaxikenutikuv.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/jibozazizikub.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC42 21108 bytes
SHA-256: ff556721498883cc657871107e01663998a15017e0fa32cbf42f65b8d7076d9b

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