Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ad74522113b8b5…

MALICIOUS

PDF

89.3 KB Created: 2021-09-07 07:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19f491860c2504fe37070085f76c7e40 SHA-1: b7e6c362f8418d915ed486b24a52fcc033674c7e SHA-256: f8ad74522113b8b5df7c5204aa51e9bddf625cf8889dcc3b95d8c5fd0c4a3c64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish for information. The file's structure and the nature of the URLs indicate it is likely part of a phishing campaign, potentially using spearphishing attachments as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612538a095991---motebikafugatenomu.pdf In PDF document text
    • http://alpha-cp.com/userfiles/file/fipigirexuxixilaj.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/romufozofegirurakad.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/vetodekunokekelugid.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607953a9ae72d---wasuzuzaku.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/dokoxatamaguwepujuwuri.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/335683597.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/s34apd80s1fjul4baqvhu9d97b/87309267306.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/11893961318.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e44f2a64---dujubobuwamo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4806d6aa36---waxosakagupipelikub.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bba5e316b95---teworojix.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/43885088792.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160988c0717889---runeregefoxoluboxuwu.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/3058304397.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/38361401176.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/91479769835.pdfIn PDF document text
    • http://pvvc.cz/files/repilamorobuzolilufopuve.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/kitafubil.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/92627663023.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d719ba381---faxizofuwudalixijofav.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8db828fad---65626011454.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/75125226298.pdfIn PDF document text
    • http://jump360.co/upload/files/20210808061831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=current+affairs+of+pakistan+2018+pdfPDF 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_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 19180 bytes
SHA-256: cdf3f4c3bbe81df5ec3d6505da943d5488c626cc5a7d5e8c463dc01a4bd21c5f
font_01_sfnt_off000124f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D09 11172 bytes
SHA-256: 6dce10cb86a44ea564a7bfd9eb942c06c85e6588038a467f0477bb27f61ab3c1

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