Malicious PDF — malware analysis report

Static analysis result for SHA-256 9893c40028f8b187…

MALICIOUS

PDF

89.7 KB Created: 2021-08-21 16:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f24eb310e7c0d60d3373524888b8408e SHA-1: e46e2894ff16be70867b0e8cd37f13f427eef52d SHA-256: 9893c40028f8b187a7236593a41f4f130215bf228d848750e94b51b2a36dd6a1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious or phishing content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=finding+slope+%231+%28graphing+method%29+worksheet+answer+key
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb96415aaca---25332390919.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dvdiri87491cbi0iei1v358j00/gimamotoluko.pdf
    • http://lycee-elm.org/userfiles/file/zolazikitulesubu.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c406a5512cfa5192575b975ea190e71a/37673479773.pdf
    • https://infiniteprospects.com/FCKeditor/file/30036607862.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d488bb0be---73045744446.pdf
    • https://vantainoidia.vn/ci/userfiles/files/1308334445.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa907eb4707---5044908852.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/cc97e45f5b6f302b3086cf288d8c97fd/nemeturiju.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/28237782774.pdf
    • http://ohappy.org/userData/board/file/samezamefaresadisamabut.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gmdcj8b2f9cc6o0uh47l5pa8uo/57664205293.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bda3f7895d6---73753967976.pdf
    • http://musicpark-live.de/userfiles/file/27709952001.pdf
    • http://chothuexeninhbinh.net/data/dulieu/files/supoju.pdf
    • https://elminhaj.org/userfiles/file/32282379348.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ca491c73ce9aac670b6e008eba1bff0a/15298019519.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0102dcdc80---87774986541.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/0402209366a050605457da9bf7744490/60906177363.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e91c0547---28309436938.pdf
    • http://edu-family72.ru/content/images/uploads/file/70308354336.pdf
    • http://norrlandet.se/userfiles/file/94953294345.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/661dd964122d91651e27dabc37305ae0/89389906672.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_off0000fc62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 16792 bytes
font_01_sfnt_off00011474.bin
8c1f2a4447781c6e3b1c097f7bb826bdc6bbb4a08e3a1c4b118b35d2d7bc60c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 17912 bytes
font_02_sfnt_off000141f6.bin
c66757cbd79d3af9e861ae790967b9f9c49b7b86b21c259c276f58a2674dc208
pdf-font-stream PDF embedded font (sfnt) at offset 0x141F6 10184 bytes