Malicious PDF — malware analysis report

Static analysis result for SHA-256 8176d93285a7a1bb…

MALICIOUS

PDF

80.7 KB Created: 2021-10-12 16:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8fbc383c412f12da5f1ba73be234fa6f SHA-1: 97d958648d8ada2c2f4aeee44ae9b9751a7dea4d SHA-256: 8176d93285a7a1bb059bca9ccea5ada3691b3f22bd2e13d9e24e3607b1593ad0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to disposable domains or compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://medvor.ru/uplcv?utm_term=tables+2+to+20+chart PDF link annotation
    • http://dfanchem.com/upload/files/toxezuxigoxogadovi.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/90697764707.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///99183719364.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/ziziwazisi.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/7207780821.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162350441a2d---tosijavizepasisu.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/65648408986.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/48678749638.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f594774234a1db0ca2f5127497e5647c/83966577376.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/38793811408.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156cda27b944---47601901294.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/59682958344.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/61560423679.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/8411140766.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615033ee75daa---42815371761.pdfIn PDF document text
    • http://lscapital.it/images/file/rizul.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/wodomamukewubu.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/25635076795.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/3fhgjitv8invk78vgqm4nld19l/56739721496.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/34364581445.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/jakasamaxomaruxeli.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/levuzemobi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/35322614118.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/bivukuwodiwaresirofiloji.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_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 10476 bytes
SHA-256: c99eb74d91823fd5e7b0b6e0ae6ad6c9c62a9ce57784a85fd48a00e45eae40ec
font_01_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 16696 bytes
SHA-256: 32e8370abd5614315d487c68702bbe56d50eb1d77d16a94d057c46c67cd3347c
font_02_sfnt_off00011d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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