Malicious PDF — malware analysis report

Static analysis result for SHA-256 abde4e0d292c90ae…

MALICIOUS

PDF

157.3 KB Created: 2021-07-14 00:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c024b7a9f3b1656b2b9d918f0858107e SHA-1: 2bc5c895d51c7de6e5fd82cbefb139ac183554da SHA-256: abde4e0d292c90aec91b6a90b05a55ee57d181190327a80f0e5d0b47f746eb6e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, many of which are hosted on WordPress installations using vulnerable plugins like 'super-forms' and 'formcraft'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://laborke.ru/uplcv?utm_term=notes+of+believer+on+piano PDF link annotation
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/a0e48543c59ac7df0503f189e16b96f5/rezotigomokomimerodif.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/308f6111ae2c3434592949703df509ba/zogofulilusozanoxobokawes.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608990e44596f---fidakasutabadibipiduv.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/belibo.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///zikapanunujitenelito.pdfIn PDF document text
    • https://agatanorek.com/files/file/4609567137.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/77110560607.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6181355a2---gaxipujizivodujalizokev.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c5f033543---96991344125.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/2a2e220b2e52742dfb4460f84bf8fdc1/kukixufakituredominepemiz.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bd8a27e2542---49729871870.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/14e8d6441c7dccf8c368372f6347034c/44476886283.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/15355698496.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/74960026389.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/tugogubajofoj.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/929313677815fa58437a69bc2c26928f/72975999377.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6a24acbd6e12e0fbfbc4a5766a7e9502/88365071890.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e69f3446401---18354035071.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a67722085b4---zonixenakejoxu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee1b82bafa---13396073303.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/fided.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d67f73ec82---17480854154.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df7fe4c0ac---gobotobanozamevin.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_off00020918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002212f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2212F 10536 bytes
SHA-256: 1431beb70edd3c79a9cc105bf01165f584547668a8b22e4ad11eda083dd8e4ec
font_02_sfnt_off00023923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23923 17732 bytes
SHA-256: 0663cda91714d37bfbebd267cdd5e893ebc7b8beff0afc510b4386f5fa951ed5

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