Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c7cf9b95630b17…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 07:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0fc7c6e906d9fa82b34952c36935fb3d SHA-1: 385edbb8e609c3c33df481c4759ef87707f911f7 SHA-256: b1c7cf9b95630b173ab868f76cb4da6874bb6720656cf7da0c8a065d53957d22
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=easy+linux+device+driver+pdf PDF link annotation
    • http://olynskiconstruction.com/pics/file/29341328835.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1a1a408a0738e5068d9390a8178190e5/96112771666.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/73617784215.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4kvqddkr0j4eerhqj73g5tak8f/10448996508.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/negupajupalewerilexiroku.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/36996869592.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/26665a39ea52774b76f839412dcaba8f/lojofenefafizabuj.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/056533e617376ba204eaa6d9d19eea71/48524330554.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0b5c349f2---84147210001.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/41547617882.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/b75ce64b6e15b5749e6813f49acd284f/70202097555.pdfIn PDF document text
    • http://leton.pl/userfiles/file/kidadonetip.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/8882519025.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/talopuxir.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9dafbc727ca37d17f46a4f91aca898bb/95539031868.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/77113630207.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/49370740986.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/zuvol.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/54858288782.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/joxinasitevibixodej.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d55d72500ddc34c5c2fafc30ed092a07/93357717333.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b800a58a58d---39690638967.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c49b81e8ecb2d4abe3fb72d75b52d8ef/patutirutufajodemogep.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_off0000cb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 10760 bytes
SHA-256: 1c70f22efe7353f6aec04d2b931880a109a47bc72ee40daa461a60bdd6dcd185
font_02_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 17360 bytes
SHA-256: 2d52ad40e35cd7e49a6accffc68992829fa32a8594c8fbaae121b1031b70ebf2

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