Malicious PDF — malware analysis report

Static analysis result for SHA-256 976170ed9fc5da61…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 11:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38e09b079ea5dcd1f9906563a628e921 SHA-1: 48b87435a3a5887e86fd0eba90e6a329f2d550e4 SHA-256: 976170ed9fc5da61b5ad041b98010f4a4c9ac5dcb9112de34b7cc722e7a9dad8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The presence of these links and the overall structure suggest an attempt to lure users into clicking through to potentially harmful destinations.

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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/fo9j71l31a01k7sgj5sjbhjict/51791259235.pdf In PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/9a383ac3c39b568c251613a40cccdc87/bopavuxenumidomofotupuk.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6ee77c59ff46a4688136183c8e742e98/34549660904.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/65287113879.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/badeludo.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/xatupa.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9871093424.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/95153805475.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/rexuleseboma.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/dujuditonitivunimevije.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/9873420462.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/eee65e1699c205b135fee0ded201ba88/lirisok.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/puvotinasek.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f93e76c832---73990446289.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/49384059939.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/kagowamadotilopejako.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/gukuvinevaxozomegekozowi.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/23n995mo09nd9gdtv3ajvh1eq2/38919521084.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429174613128.pdfIn PDF document text
    • https://banghenails.com/upload/file/85359761662.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/65718192946.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/943bff406decfa15728caca1f559b6a6/tobagame.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/bajelobopixufudagafawosin.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/10675787606090d386a881e.pdfIn PDF document text
    • https://primer-spb.ru/files/files/biduwumama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=just+give+me+a+reason+piano+sheet+music+pdfPDF 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_off0000d171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD171 11180 bytes
SHA-256: 2fa8e8b68f03f6e4f84c2e9c5db21e06bb96079f4c0734a45cefeb0372dcdb6a
font_01_sfnt_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 16928 bytes
SHA-256: 313c53e94fcdba068ff13ce68cdcd0321b393a36b7aceba46690f0045af5f01c
font_02_sfnt_off00011634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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