Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfde542f7e09206…

MALICIOUS

PDF

87.0 KB Created: 2021-09-17 03:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b16f16aa85cd5143615d217a6533644 SHA-1: 301350441bc7a77717d8bbdd0b973c8bbc0a1cea SHA-256: 4bfde542f7e092061196aba8dd3f45b0c1ad34088f213465b0e03459e98f0e35
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised CMS upload locations and disposable hosting sites. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/cdab768c7eeb67db011e21c6fef1cbfa/rasisoxofe.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0v5b09sbebnicp7qnfopr8vil5/menejiwesawagube.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-13/20210913010808639152.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/xijowobodamuwaz.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/sokewebefezejira.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/lefesas.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/nikusamosibavovenuxuxif.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/zujagixededowapazut.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/folunumokixenojetagew.pdfIn PDF document text
    • http://dsraxys.com/uploads/57922111378.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb55c7f2d---64935518822.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/21914597694.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/napekepel.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/vuvajowebuz.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/xanuxeramosuraxi.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/98007312287.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/8841753810.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/39702196158.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/43080401325.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/85877236205.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/golajo.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/gagilunevogijujebag.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/kanaxob.pdfIn PDF document text
    • http://mamitobe.ru/files/file/xuwolowimukowowopalererel.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/fopodojo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce6006874---79467718478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+ben+10+gamePDF 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_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 17172 bytes
SHA-256: adb7175a30e72e358cd5ad30a7f337e89cb278ae9ac0f5349b317d0b2121e7ba
font_01_sfnt_off00011e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A2 10572 bytes
SHA-256: 0df8092e7d6f22b769b341c15577fabf292654220635ef67070d48b5dad082d4