Malicious PDF — malware analysis report

Static analysis result for SHA-256 b085d7c2692c7026…

MALICIOUS

PDF

128.6 KB Created: 2021-07-01 23:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 026f91c07ebbc5904bdf85cd3c1602b8 SHA-1: 18a832a933cf215550c736ec53a134cf197c714b SHA-256: b085d7c2692c70260e2a22beb0b50ac732346a90e8dd9405c2ba0437a9396bc7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous links to compromised websites, suggesting a link farm designed to host or distribute malicious content. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9689

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/90b5bd5f01d6ce74f28cd1ca13b5a0a2/66666917696.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/28c00e730048f45341932e22983497dc/dikekezubukodorigube.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/97032981573.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gamulumuxejegar.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/58149729537.pdfIn PDF document text
    • http://df-foundry.net/d/files/vetoroku.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/66661697615.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/md6iql55975dabvu414qr0hj32/gixetozoxivaxiku.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/51d25f48b54f27ef54bc7500f995833e/zajaguf.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/5b2161af2426f9a278bb5ce6a8a8b4f7/banatapisewomiro.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/33756956981.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052723041773499.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/fc5a516cddff51b66438384bf9481ddd/64084334061.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0bnkj3s3mkg6cedlbijtn2lulc/10761232409.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070aba972344---tewopomememuxavunezol.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73c91e0c2---rolop.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/volivikef.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/mifasobupux.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/3d2d312a3ebf18ee4075da7c7c211a8a/gokaxinurinevobojutilufe.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/837bc0a22fc96d2c1764d86c43cfa8aa/89316643920.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/81646654079.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/65233727921.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/52095776176.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091027e72d61---57484632010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cities+skylines+traffic+mods+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB5 25892 bytes
SHA-256: 36697d0986154ff035d028ab430c56565523fcf888bede586aee90d1840c31a1
font_01_sfnt_off0001a4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCCE 10960 bytes
SHA-256: fac35d0b5a17407a1ff92d66edcc315276807652d7c25095304cb348711b9129
font_03_sfnt_off0001d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D652 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_04_sfnt_off0001de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE55 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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