Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b92af09721b03a7…

MALICIOUS

PDF

94.2 KB Created: 2021-07-09 10:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9a71ed188f4a1ac890e9ad4c97adcf76 SHA-1: 2a3a34deda3db86dbc84c9d6cdd9a0cfc5295002 SHA-256: 7b92af09721b03a7273ffddefe7280b3202357579a8855d369d3d06b31e9f330
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple links and the use of disposable hosting suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://popnmusic.fr/userfiles/file/58758019506.pdf In PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/247ea7ff8d3f35737e0b80e46b155af8/rojepazasujaseza.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/30891564158.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/312f07b8427661d3f2fc561ee671a9e9/pijakojademozizis.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d8a13242---saximebadawejagesititedor.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/49668497843.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac94f4638a---27184033848.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/silomun.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160abd65c13714---83016219520.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/46486600848.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc91ef024b---66138660208.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/43778b6d643665769e0d4910633c5aa0/rixobodine.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc469332560---pobamagazizakezi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1041cce96f3e79046b22e22855aacf40/kunelufeguwowet.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/19376613082.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412ec23e0a---nexavipalipubelazusab.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/78513328343.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05de3d80aa---vugosogemexuwuxuwibi.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/litelozi.pdfIn PDF document text
    • https://mszukam.pl/dat//file/35789560427.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/bagumiwenuzekunazu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/0767ff865750f4646081439988ae8b53/pufijupub.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/61067864816.pdfIn PDF document text
    • http://halmar.info/userfiles/file/75532118283.pdfIn PDF document text
    • http://proxima-design.cz/files/file/duxosabux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=delta+heavy+launch+timePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12449 10388 bytes
SHA-256: 1d5cb0f0608b258d4ce847adc50df3cd6c01f4916fb3d16bfdfccd942f068162
font_02_sfnt_off00013b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9B 18040 bytes
SHA-256: b6a85d87ebded9bc71c0fac0ea460ffb4c72853585bfeb17854cf258e27b67d9

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