Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d1e83fdf38b065…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 03:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80e89a4881127530b72530ea9ac663a9 SHA-1: 59a6bdd4aa99930d0094f65bfd1b8cbe06117bf2 SHA-256: 77d1e83fdf38b06565bdaa088d5e1844f33631586c1b72dd34cb381cfdfe0a21
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple domains hosted on potentially compromised WordPress sites. The embedded URLs suggest an attempt to manipulate search engine results or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a440d06c0ba---xezidozogut.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8597033166---46410080784.pdfIn PDF document text
    • http://kleiberit.ru/files/file/64923514135.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0b639bc4d---numigojotetaxo.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/76582026669.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/da15d4195bf6d4e25e863e074d7a173d/17081487842.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c898c24ffa---besirexewired.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/823f5006f4897a6424249cd0b9a0bb22/wativotujuduluvuditevebe.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ef11ded62---45864689870.pdfIn PDF document text
    • http://www.bandungmesin.com/file/rexexasuwibexalepe.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c560cfc14---22647084232.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/28634491854.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/51650991961.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/lagevilejodurumu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7a6696df2---pazosaraxugakakomomeba.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/86503500370.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1c0923f14---68637048496.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/20200863461.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/64038163093.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/43329496478.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a585f543d05---50361512214.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/nobisenirosorurosupevot.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b1d29a77d39dbb9748fbcdb5406cb888/garawatifabovedazir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=garganta+con+arena+partitura+pdfPDF 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_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 21920 bytes
SHA-256: a334191da3e9b84334714cc189b1166e65157380aa50e3145593cb9b40f01c5b
font_01_sfnt_off00011611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E28 10720 bytes
SHA-256: a2f757ecdfbc489abe87136df116eb4cf5250c7a272f1de364ea8c6d4bcfbbb6

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