Malicious PDF — malware analysis report

Static analysis result for SHA-256 e209bdd044f9b077…

MALICIOUS

PDF

90.0 KB Created: 2021-09-23 21:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da2555f55d170d7c2afec0b04d23f34e SHA-1: 0e7ca04059ab3d18767143130bf812b7e12e605a SHA-256: e209bdd044f9b077cf8f5337d1cc0b992a7952e832fe91f5a3514b43c670ce5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a distribution point for further malicious payloads or phishing pages. The `wkhtmltopdf` authoring application suggests it may have been generated programmatically for this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=spesifikasi+jam+tangan+samsung PDF link annotation
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f040d0f7438f993b7b2a460c22c9edb2/fevevisinowuvodotej.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/wikurimexasu.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/45868023964.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/lifititujegilowej.pdfIn PDF document text
    • https://portoggitter.no/content/files/userfiles/file///sosulukumitededuverona.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/98205973057.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hgctppplkkf0ltrs7vp9k8b2hd/galorurokebifelemi.pdfIn PDF document text
    • http://shahgrp.com/uploads/fovuxoneniwutozamegimute.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/52062744469.pdfIn PDF document text
    • https://ocw.tw/uploads/files/23580467974.pdfIn PDF document text
    • http://kustari.net/userfiles/file/bifutu.pdfIn PDF document text
    • https://digicpictures.com/downloads/tijepasad.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/njmmbked4om2gbj06tc40viqo0/wapagezimiminewotus.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/10482525999.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/vajixisugiferefepedus.pdfIn PDF document text
    • https://sergiomauri.com/images/file/25580738854.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/98715158046.pdfIn PDF document text
    • http://baove24h.org/upload/files/nodelewiwiri.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/25709979020.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/bepipavobefutadisezigop.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/69150064447.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/vonolilawavex.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/47627915612.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/47286567990.pdfIn PDF document text
    • http://come2menorca.com/images/file/zugeruf.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_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 10832 bytes
SHA-256: 80212692855e201b04d1598467744a0a2d6f175825baba6844ef9e5001c729c5
font_01_sfnt_off000114f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D09 17192 bytes
SHA-256: 402f8e2ef8b1520500513033a2bfe2931b9ee027e214c6331a8ad01fcdcfac3a

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