Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a2b4f5520386d4…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 08:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d902790280557d9f02a3e0605109d49 SHA-1: c279a34f85d6e424da8d6ad590f872de0b9ce93e SHA-256: d8a2b4f5520386d4486fea6734a73f81e66c8daa305f16a04b3e4e2f651186fb
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious content or download further payloads, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://koncnc.com/genelresimler/file/dijume.pdf In PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/9a17293c170204f7d8d4c23361125f74/safogomuvajufe.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/d6cb1ee822f8ba17fac0b4d70f515f83/33575876658.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/29044062530.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9f49d765de4e5a69f4a1be2ad1a78a63/32075712850.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/88285798930.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a41a2befb13---mufodoroperigawitepazasi.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/94g58etecg9qlh3k1er84oj8hu/56574135814.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/61224355418.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/62515696979.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/giwejibizuvokodezalokufiw.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/17483251164.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/xoximelewoxa.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/84073426388.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-13/20210513213412912085.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/vho3rok2h5tf79cjda1ptr2347/31459844540.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///38902736756.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/bbc77041ee9508abf77a5198e492499e/pojibikuximoru.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/faromaz.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/givazuwuxege.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad62d8c2374---33546783373.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/10140520212.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8a7012c83---devokamofanetigafovoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=first+readers+books+pdfPDF link annotation
    • 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_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 10548 bytes
SHA-256: 57115425cf7fc7aaf80f2d256ae24e673eae88646174e851a6535147817ea4f4
font_01_sfnt_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 18112 bytes
SHA-256: 50d61f18000bfc1e219b324f3c40f04acc3d98e67c9104fdaa98152e34c9bd25
font_02_sfnt_off00011805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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