Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ea7b94946ff4be…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 21:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51e15b8842d78625e32691607fb9f634 SHA-1: b6aa57cdb53a9c1fed5c4350d650df3a0a741fce SHA-256: b4ea7b94946ff4be60bfefc7b965479e449a33419dc7ad41a25a25ce5d4e8e11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=marantz+consolette+manual+pdf PDF link annotation
    • http://orthocarecentroortopedico.it/userfiles/files/jewotubopumi.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-1/20210501152425447530.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/vdmc20hu8id3q4h2vgjktlo2ep/65445635308.pdfIn PDF document text
    • http://podarox.ru/public/files/91403186178.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c5f42de2c---sakemasake.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/c0a531d70377bb07282a31cb8181a271/2241440748.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/kivajinovazopajosimiguzan.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/96552467787.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0a965590---57455067169.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/2semc2ki2guc57ep2l2me3m5qn/fimomix.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/53f933129d4734b380cddd5b9bad7543/91470240179.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/33204940507.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29a60e423c---xobarule.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/babowida.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/87308498449.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7jicg1ffs034b7e4bm4qprlu00/69320901183.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///38503063746.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/99323607605.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/30/file/20210630_074330_147.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/nasifezarejom.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c1a27f84b698e419eb1c6d7f8071007/fifigotigewafetoxuna.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce27951904---talifenogilabowure.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/fuwavudakuzenezujirater.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c43cbe5735---49895419123.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_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 17224 bytes
SHA-256: fae64d612336e2fe8bfd8d6a1f6ed1f7274a3d19ef206d3bdd099b89e0d20e88
font_02_sfnt_off00011db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB7 10844 bytes
SHA-256: 1300120e916eaca28f2d78c3f84a32765bd6c155be50ea9a1f600f7f5eec8c19

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