Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1bad81d06e7c12…

MALICIOUS

PDF

94.9 KB Created: 2021-08-13 04:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67cc2d486bcca6e15bd8c867aa48c621 SHA-1: 221dc6e14d92927f44de65b5fc404494425e998d SHA-256: cb1bad81d06e7c126da70caed72f8b45d71ee6d9e4cd69c405261a2f3702fa59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document functions as a link farm, directing users to various URLs hosted on compromised WordPress sites and disposable domains, likely to facilitate further malicious activity or phishing attempts. While no scripts were directly extracted, the PDF structure and URL patterns suggest an attempt to exploit users through deceptive links, potentially leading to malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844bacd9bed---bajakawulor.pdf In PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103c5c195096---72726216545.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d101aa24---rebemokagegevurexonusada.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/1211982786.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098787f94280---fibizilide.pdfIn PDF document text
    • http://aymexco.eu/ckfinder/userfiles/files/55742658851.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1f421deb06d5cac097ef708dd87fe4a2/7373971750.pdfIn PDF document text
    • https://biocoils.com/img/file/sosoxase.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210809_9CD1B4BEEA3D3CF4.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c899a5e629c---dijigosavipegi.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/86306073911.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e843bb6c4a5a1b5a4bf872c98250d71d/83495366016.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/18050380647.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/liden.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/98792123410.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/71342734706.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/31796825695.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d48fb577fe5---zitaj.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/1779445560.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160871fe1638db---60200956558.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3bb9c12117eea2ffac06796d7a1522d3/37749236440.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad93570819c---nigokurav.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e835f2e1866---bebuvofalujowojemigem.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/simije.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb87aab3a---talesojekarezodejavotes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=forza+horizon+2+demo+xbox+360+downloadPDF 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_off00010e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E29 17140 bytes
SHA-256: 94e67d2d5eb6b854fde687fa176effb073074876b5aa2879afd5089970ab8c56
font_01_sfnt_off00013b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B26 11192 bytes
SHA-256: 2491b30a767af7e887614b769df3f601d6c7e93110a34e86c872b7b689ba153b
font_02_sfnt_off00015533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1