Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e75569fdbb77fbf…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 08:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc88d7b7524fc3a5e4c24d2664fb7522 SHA-1: 2a4dfbd44c3be09fbb1c119ec2ddab3d7c3466c4 SHA-256: 7e75569fdbb77fbfea2079ba85bf95600394a512901a57f9aa6e51c7aeb1e4ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of 'utm_term' parameters suggests an attempt to track user engagement with lures, such as 'grand+theft+auto+chinatown+wars+apk+download', indicating a phishing or social engineering pretext. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=grand+theft+auto+chinatown+wars+apk+download PDF link annotation
    • http://ihdbd.org/upload/files/67584370563.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/92531794739.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/57988090638.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/27517139075.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/88106141473.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/siwaxedovemif.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/pokuzirureke.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7c32c08fb---jixusef.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/80299590672.pdfIn PDF document text
    • http://ilkemymm.com/image/files/ludokodetu.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/98667943991.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/zifux.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/vaxofupojemazigawoto.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/zadunurefubofaxegaki.pdfIn PDF document text
    • https://terracell.pt/images/file/firerikurixodajoreb.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/53870223687.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131f6f377e0b---50748312132.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/gusifakupukanevovujej.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/venojamonelate.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/dezelo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161338c5bde4d9---bavurekokafatal.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/71749811229.pdfIn PDF document text
    • http://air-ned.com/uploads/files/11735308171.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/45182045471.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/28679287477.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/43be1ae13bdac5785a096f86108ad8a7/zusitujogikaxele.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161334ac44596a---wumolaveparixidogak.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_off0000e12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 11036 bytes
SHA-256: bf4207f3f3b76f1199a2f1c87219a069ac2c6086b0472827861c80682a3feca1
font_02_sfnt_off000112f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F1 19520 bytes
SHA-256: 7673940f7ec4d93277960437ebd5dd7c1a88114a02f7a187454d045931347b3a

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