Malicious PDF — malware analysis report

Static analysis result for SHA-256 a683ba58ab36b56a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 21:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbbc577fa067e83f3fe2cfc890187607 SHA-1: 3f1fbde9f8b08dee20267a0bc0f4b9264c39b8d5 SHA-256: a683ba58ab36b56afd5aa05a01a1ffe526a8ab291d70b2b89c6fd5952c656c45
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to external content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://bliznacite.dvsportbg.com/files/57837428226.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b5f43b07---rixukazagapi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352bcb76c28---57446073572.pdfIn PDF document text
    • http://samtle.net/ckupload/files/tufur.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/vimupaba.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/kurizifetanu.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/34039569094.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/92781212347.pdfIn PDF document text
    • https://almavilag.hu/files/files/21479866790.pdfIn PDF document text
    • https://ikansambel.com/contents/files/83733706380.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/bumorubetezexo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c29b585a23---mivawaxuv.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/todafaperomukexotovumolew.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/dukurawawodekufetaxoguwan.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f38dd5729---xutidoz.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/0hdev2cl8thfo8r4vhl0rfvc4b/68971147867.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/83782002941.pdfIn PDF document text
    • http://selidbe-beograd.info/files/xemofomusamo.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/losorebuviwiderepule.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/24326671472.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/fobife.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/zixovewigapone.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/19572771046138cdd700c91.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/49497938646.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///wiwegewadojibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=universal+androot+apkPDF 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_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 10552 bytes
SHA-256: 1f7b82db2f922b27bc759eac013ef4e63910e768d3795aabbcf7ae90dc991124
font_01_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 18408 bytes
SHA-256: 1991fca7223ab50399417377af9c0cf3f3f6f798d055346ce04097b800cc70ce