Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbeb72abc33b53ac…

MALICIOUS

PDF

71.5 KB Created: 2021-09-09 06:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 556a606c4ad2196295512630b67e3b3e SHA-1: 718d9df07a918ad0ee1c98d8698f8d6d20389880 SHA-256: bbeb72abc33b53ac4ab48f28628a114a47311838802e9445300908737eeb3763
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=cracking+the+toefl+ibt+2020+pdf PDF link annotation
    • http://zamdq.com/filespath/files/20210902181838.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xuleb.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47c522dec---zugevunikajunerivoget.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/9071553428.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/gurugesaka.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0973b86297eb2f4772c1b4f4dc2b36ec/kupibekanuxoz.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/10962513224.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/gamivavovoti.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/46985816467.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/sopobemabuzamovipizopud.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/pufumegetazidela.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/94072640475.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/tusoronumipulamekafi.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/kalifomuriguxizekag.pdfIn PDF document text
    • http://chinalabware.ru/d/files/41836981522.pdfIn PDF document text
    • http://kdekdyjak.cz/data/85134780324.pdfIn PDF document text
    • http://jonme.net/ckupload/files/87739627219.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613317ae387eb---47866655852.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/10475506828.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/21865470133.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/17901963417.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/pivisobotejujufuputos.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/tuguweveza.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/luvikedupab.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/66744259468.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_off0000b598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB598 15980 bytes
SHA-256: e4b2dbb4be7680688725cbc3754be808f77d0106831cb7893e35b56711e808ce
font_01_sfnt_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 11236 bytes
SHA-256: 9cf72d8683c486786078420914131995b517e0b5bb34e02a99b1135241f49815

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