Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9f8bd5e52d0cb4…

MALICIOUS

PDF

83.1 KB Created: 2021-08-28 17:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e3da6a243861770474d2cb09cf0e4d3 SHA-1: 74ec6b959381a23f8f64700f4f1fc8ff1ddcf305 SHA-256: ec9f8bd5e52d0cb4c9c3d980ccec3d964fae5ec29b52bcd30354d7bc0c040bf1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised websites, likely serving as a link farm to distribute further malicious content or phish users. The document's structure and the nature of the URLs suggest it is designed to lure users into clicking on these links, potentially leading to exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=hmh+american+history+reconstruction+to+the+present PDF link annotation
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b32fd156a45---70984164123.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/61732580886.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021072614564173.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/46750794308.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/65393548540.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/wetut.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/vr0perl0hgfc9n0jl3cb95thav/dujiwomowinofuduzasa.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e62d7102c1---41617353485.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/pdv016rkq0sbmaej0q6bv4dq95/46281181332.pdfIn PDF document text
    • https://medius.sk/userfiles/file/79917621711.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728033ccbcc---jeworipiwok.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/77330245459.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/5rq7ua7mge1iojpia6nn9vt9q3/xesiwozisu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7052e1bfaad86abaa84e58e0acf225fa/woxibigetew.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/51841114449.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/zuzilagudowurabefite.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/69274717953.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/bikefasefobasopanugu.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/mudirolakiko.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/papetasonoboganitavaxe.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///33745685223.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/60270043833.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca54bddb0f---73434317349.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_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 17720 bytes
SHA-256: c7a6fbd31d0d2b224169b388d0d088662a1c9f5f97513a28ab7ef1cb04c07c8a
font_01_sfnt_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 10796 bytes
SHA-256: 116cc96b27676b027323a9666eb5f164137014a81f0cbd96eddec4a7c29e5c34
font_02_sfnt_off00012596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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