Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8c7a25fc65d071…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 19:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a90c5fe7d00ae8457c021745fe166786 SHA-1: f3d5ab9ad7480d3dca2bb82db8f1c1db8eeb4295 SHA-256: 1b8c7a25fc65d07164afbce3e77f26596252b1c78415e58da41cba92956969cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs, such as 'https://drafthe.ru/uplcv?utm_term=complex+analysis+pdf+bsc', are likely used to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=complex+analysis+pdf+bsc PDF link annotation
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b650e83e808715479ddf4f3ee91e89b2/gufijugowumim.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5651ebf855---97512227433.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fjmnrq3bo3u5el2mb6iu88ld60/71831763036.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1c1240e79---85068748833.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/58754470544.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/975085955e334dbadd1faf7dc7837db3/fetenuvekazanemalakifadoz.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/kexujomimilusupifu.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/datav.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/fanixegujorixisek.pdfIn PDF document text
    • http://aa-nusd.jp/92717907987.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/fuvobonurawupoduxoji.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/su8j5k3gmgg7n2ipbs18phhp7m/7575597789.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/udt504l8hr9obdct5u2j9p9huk/48807716694.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/15586321096.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/vakopu.pdfIn PDF document text
    • http://seamacros.com/upload/file/54323080771.pdfIn PDF document text
    • http://andrewclaymonfishing.com/clients/a/a7/a7b0d980ee28df7184f998a87a00dbd5/File/24298521374.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/44901371114.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/nuxowamowikoxubezew.pdfIn PDF document text
    • http://ropesadventure.com/d/files/30082121872.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa06c8c03b---jituwabukiliwamesobulide.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/g6l5l8k8b3gi8f013ejd674p63/64037164361.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/2723081354.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/p3htvspju93h8veg13sh252p21/deluvaniduxaz.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_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 20732 bytes
SHA-256: 1ae7a276ef17bab084623f8efff370193948091f12da61424015c4b338069057
font_02_sfnt_off00013aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEC 10972 bytes
SHA-256: 426e2b83830146f02dd27fe337754d5bb86d1b9dedfa26999b470fac978712e4

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