Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3112dd31302aa4a…

MALICIOUS

PDF

81.6 KB Created: 2021-08-19 02:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: e74e9a8c0d55f583b594420d290e588a SHA-1: a367738cdaa9d92c96d12d100132cdfd0ffcc4f0 SHA-256: e3112dd31302aa4a0f836e50505b20f3c6ca3f82bedebea6f1c3ab58cf1c4b58
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It functions as a link farm, presenting numerous URLs that point to external websites, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, likely for phishing or to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=how+to+bypass+icloud+activation+lock+iphone+11 PDF link annotation
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/h7hdf5nbjb95g520vc03ria3re/gikivefivulaz.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/d5939362ac74df351fa856f7a1079e13/wusibefudagitivugamov.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cddb51947e---mopifilomaviderazezedu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/qdfee9rh7evjopltklfsa365l3/sofanala.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/kuzejulijalised.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/1mjmsp2gcfgda7e2q9nt919nhp/vefewudoteda.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/murhcilrf0au7fqrte6mphipmu/sitizikinu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ac749620---25921374373.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/soripenemafiwitot.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/37111067418.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/18749056551.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a6li6g4pd29viv83u7eo4223c1/49680033742.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/91467360043.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4977bf47b---44413229227.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/wupuka.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/176f69cad911fc95c7b851c755d2ffe5/81033577272.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/78080473022.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/11877326444.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/49211655929.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/29842132842.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/14808336212.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7e90c0a8cd1451960a07b151689454b3/83814474357.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/24486923334.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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 17068 bytes
SHA-256: 7ec32af5d85a552e80cf78973c73e8aadaff6465744ee56cc66fd548e88628c2
font_01_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 11152 bytes
SHA-256: 2fd1b2cf9a32b2dee551d30708e92744e793530ecdf08e76e160e97584950679
font_02_sfnt_off0001206d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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