Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ba4a06cc0bde64…

MALICIOUS

PDF

87.7 KB Created: 2021-08-22 00:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4dca43119235b9b0090d1a7b7a590f11 SHA-1: 3bad487cdfe6657e28e091aaf12a6e719a00c54f SHA-256: 72ba4a06cc0bde64a310cad0fbd04e99e1ba969216fb4339a9f1e259f2593c2f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The embedded URLs suggest an attempt to redirect users to external malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://rhodeislandalpha.com/clients/56223/File/galilur.pdf In PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/butakosujososo.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/bavuwukesofiwun.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/24002680203.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160f762110b022---29246245963.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/2f2071a34c2789a3a3243d7533f0bb7d/36912615581.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/8950519720.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ae20c258b27110e70eeac7448a38556d/sexesemu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce5b15749---81461226202.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/bb5e15c7a2ffbc75fcc8d2dd3cc86bcb/90789390041.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/matinibavututibejup.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105333054492---xanuvoxudutatedarerona.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/76666176078.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/54318453936.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/84834007689.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70edd975e5---pigifijubexutefuliwo.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7a667bd6---zevamiwumoxekepuj.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/laxoputopovefitinudib.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2005b55ed6b0a7d04eea72fd56017635/87261054790.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7efe48f77312df6df0100eb1e8049935/mufubuj.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0eeba0977---bixemopavalisoxa.pdfIn PDF document text
    • http://gekon.net/userfiles/file/bijemutaretiposom.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/fivimifojewodosokuvokov.pdfIn PDF document text
    • http://splogservice.ru/content/file/78211691997.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/c65df0c087cf96a0070db7f8c2a5df81/luxidobin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=frases+de+dios+de+buenos+dias+para+mi+amorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 10624 bytes
SHA-256: a3d567707263a875e90c0c02db83f8f0ae719f735e3c90fb32990f0d340339ea
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 17012 bytes
SHA-256: a369daf36f23378f66f00fb6d374b4b2a04a20811fe6e7746feaa9d522db5cac
font_03_sfnt_off00013603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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