Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb63ab2825fec243…

MALICIOUS

PDF

76.8 KB Created: 2021-09-20 22:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 552a15a0938d5aef6d7722caf7f352dd SHA-1: f569758ad9bda4e782112945d1c8528ccdb2332b SHA-256: bb63ab2825fec2439e57f56ce2f795e577df7f663a30722504ff8f23f6e6a88e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to disposable domains or compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The 'SE_QR_LURE' heuristic indicates the document instructs users to scan a QR code, a common tactic for directing users to malicious sites or app downloads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the overall structure and URL analysis point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=scan+qr+code+app+download PDF link annotation
    • http://grandp.ru/userfiles/file/jodadufarusuxijasu.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/13777338408.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/16639245627.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/kajevoz.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0fd3ebd8---24834634565.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/gavobiponetidowa.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/33657441347.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210909200428.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/jilamatisimorixoxanum.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/kenaxefogirisiserabevi.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///43017447287.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/wejabadaresuxatijef.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/56752683476.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/zozovitobisuzeziwo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9c09e705525e7964d1c0ee4a4f244da7/24839263606.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/fozazubefewetujadameza.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130f9694b9e5---55568412548.pdfIn PDF document text
    • http://archbot.pl/files/file/91763838652.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/xapefukesatezexaj.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/36205451936.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/81345965498.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/43525251604.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_off0000c85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85E 10456 bytes
SHA-256: a8c13c0880f84065c2d1c8895b2d54f3ff15f289bf1c07f54ee1e9593ab4452f
font_01_sfnt_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 17636 bytes
SHA-256: c323f90d015339255ffe1d9e199bd2edb7a9cc91d1786e5195ac581d5da05f3d

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