Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c52fcfd8b779ddc…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 15:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7b179fc1e2a5e39788a957601d73c19 SHA-1: 2b1a5891e6da9bd3d6c286820ebf1da9015eed7f SHA-256: 3c52fcfd8b779ddc69b8772c2990cebb25436fa4bc1663a729816599d35f2a11
176 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to other PDF files hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'link farm' heuristic suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=cast+this+phone PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d732b3634---83563784970.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nutumowubivawezopemetu.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/89995012382.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315cf3aa90c---dazeboradokod.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210913182818.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/dadek.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109171138245011.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d616c9aa8---22239999975.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/bugigukalunoxezeb.pdfIn PDF document text
    • http://webs123.com/userfiles/file/jiripe.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/wutijatulopusobu.pdfIn PDF document text
    • http://bushurov.ru/images/files/bulom.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/vafalusagofonojobet.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/68613016759.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/61712400836.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fc9cb10c772ae9c643645b9b24a1151b/xafikokoregemuwekegep.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/teferodo.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/56408343213.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/40601950595.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/91090117495.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/kapewepupisobasidevopila.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/97141974559.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/6922583490.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_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 10236 bytes
SHA-256: 51952ea88bf53311e3b91a1405f4539e97e63fdb0e2f40a520bc99df139412ba
font_01_sfnt_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001184e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184E 18544 bytes
SHA-256: fb1a16f6efa507d5e14d6dd1d9c5218c0257cc57679de74135a17a751c6c42b2

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