Malicious PDF — malware analysis report

Static analysis result for SHA-256 89631b9c71bd0a3f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 21:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b063af388d7c2856408559c00528c0a SHA-1: c64c107367a5bf5759965493b72b8f6093e1d028 SHA-256: 89631b9c71bd0a3f957f8129918819e0049fd060ad5c0a139e7cb037ae69c6a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://drafthe.ru/uplcv?utm_term=calculus+demystified+pdf+free+download PDF link annotation
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089eea5d832c---31354060565.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/jagezafeselewatife.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://szpk.hu/_user/file/72072770860.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/gafoz.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080431e7a26d---20139212105.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/karavi.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c0603c0395bc1b512842846a8046e6e2/digipipimotisog.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/48752588805.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/0cd8c1461b97a4bc3da7810a97dc4fc0/melugenakixo.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0b3a5b3d5---tidalekimepuxozofase.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/58323053739.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/a4380mong9sfs1r2elruehfl33/kezufik.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e91dc95524---13106536343.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/91060366229.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0f28c5cc7dfd40f970daa331337e6dcd/betun.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9qn0nbsel7pjnahse15ersemva/pofukaxizofaniseropufeni.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/sikosowufiwopeko.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/lafuloluveraweku.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/solovopipetow.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/xalakekatubifefonororafu.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/52033430358.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/8c57222bb656a28cd9f6c98dcbb08f46/68425860797.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/52391404637.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_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 11112 bytes
SHA-256: 1eab1997c4b5560749ae4b08993469a664a389dd6442473aa33843f7e13e4a55
font_02_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 18668 bytes
SHA-256: 08037f316b4c3878a7b3d2dc06a4d21267f6d51af9cea86020488c8987f75033

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