Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a5aeba5ec9ecc3…

MALICIOUS

PDF

68.8 KB Created: 2021-09-05 23:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d9ac9d5e9486302726acfb5d20d027f SHA-1: a2b12a2377623b1fcaaa4de17db7088ededa22f8 SHA-256: d4a5aeba5ec9ecc30037d80946b4fbef0251fc31fa6dba22cf7c86aecda20a51
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many external URIs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a pattern of directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://coretry.ru/uplcv?utm_term=aptis+test+download+pdf
    • https://alshamiltrading.com/alshamilfiles/file/detidogogutejaguzenag.pdf
    • http://irinabailey.com/upload/files/ximesapuwupijeromixowoge.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/25e915dc6194ee660aa553ddb038c892/17462295901.pdf
    • http://szjg.hu/images/file/gedezitinapefexulaton.pdf
    • https://askisan.com/upload/ckfinder/files/xolawef.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e33de9798---xuxepudubijasusomokedol.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/49345906975.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be07bbc86aa---dotexedatu.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608629f75fdc0---foxenazizo.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/5180850097.pdf
    • http://cpils.com/userfiles/file/xovonewatipivagufigi.pdf
    • http://brandnewgoods.net/userfiles/file/2362240551.pdf
    • http://zartmobilia.com/userfiles/file/20210615171923.pdf
    • http://sistersaviopublicschool.com/userfiles/file/wixupof.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/08b8981f3fa3327adb6b563533785fcb/65386688934.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/3d2cc4276007d2670cae5665b99d4e5f/xawilozelozezujiwu.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612dc2691c3a1---xokavawekazab.pdf
    • http://signauction.net/userfiles/file/fozasopuxo.pdf
    • http://joyerialaplaza.com/ckfinder/userfiles/files/vupuponurabejagebigi.pdf
    • http://yavuzselimvakfi.org/resimler/site/files/79144419617.pdf
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/sulobowo.pdf
    • https://petikdaun.com/contents//files/56634616469.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/r165j1qlk9m1msa40dauhk111h/nadezibi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b186.bin
4990835cb52177f012126602336bd9864f018dea47c147cb3ae3710f18a65a5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB186 14544 bytes
font_01_sfnt_off0000d5bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 16792 bytes
font_02_sfnt_off0000edd6.bin
b3dba104d295574e66e8b79de9482479d861ef92738652b0c9350cad699952d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 10456 bytes