Malicious PDF — malware analysis report

Static analysis result for SHA-256 9579441da5a047da…

MALICIOUS

PDF

75.7 KB Created: 2021-09-02 06:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b44700907d99c89114310f89793fc0a SHA-1: 4a5fad55efe06261e8f240ecfb5ec8938901702e SHA-256: 9579441da5a047da3f18f923e357f26d904bb16776632308eb4f6d715ca50d50
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. This suggests the primary goal is to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/88725810b4433382bb718f17d515f1cd/68812102003.pdf In PDF document text
    • https://serwisnawigacji.pl/userfiles/file/zugelebopefumumera.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/65919395575.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/pesewiwuvasi.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/44271868120.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608430a5a9a5f---xowipotobu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41e1cd17c0---69516182418.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/190884503760e4ec1a6fcc1.pdfIn PDF document text
    • http://chayka-svg.ru/files/50931275125.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa2d52036f---29617323951.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a8cc9bf7f990fbbf597aeccab4e00f02/91412487653.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/gd9si67tqc487rhocuv6dd4n7n/nemalar.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/9601413874.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/26581893515.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/zelepetinimawam.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/kufejoreloxonoximul.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ripejefar.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/sopugonasovosotawugiwede.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/fa0f37866da67759d951a6eece006cfc/kikirejonofegewumul.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/20686338451.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/ruviku.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/kagowida.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/tilixu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f23dac3c0---51798345758.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/qe2imqcfkf968d9gbakb9c30d3/junexibupofesididovetor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=food+rich+in+fatsPDF 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_off0000c6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000def1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF1 16572 bytes
SHA-256: 909a527f6e815bc6e1c4516815e38501a3adb76176a65d7f81f9b5896980c4d6
font_02_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 10372 bytes
SHA-256: da3cc8012ec90aa394075e8f42671e374061892a88caf02a5f3194d5107d34bf