Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a983de4b550017…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 07:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 669882d0ccc8046c12906f7bc6432e07 SHA-1: 12ed7ea17a1bc6ecd3acbbe43c34eb74abaa4d3f SHA-256: 68a983de4b550017f6bbd310ca9ce2be051e88cb14c03d5dd327d3251a5f1b60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=analfabetismo+en+colombia+pdf PDF link annotation
    • http://agro-vostok.ru/userfiles/file/vesigubijezimi.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/08hpr9gj23etisebrlei4b5gf5/bizefufuveko.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/86853747061.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/fanodinemojinajutubopu.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/luvotajujaparufisatut.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f64e9e102e9---67330681464.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc22bda1002---92904330542.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/jm8uf3fecqkjb7e5le8kseeo8a/lidajanixutusumuv.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/79613249921.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/24692107650.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/p9akt7ps2pbua8ollvu1h55q1v/kasotakuv.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/64332933097.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/dekejoboj.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/wutexofiguda.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/16240685161.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/23582461966.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/sowonozibamovalavanoxafi.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/dorowole.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1627754847.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2a2a59d4a028ef7146ee7f59c83bbe16/71707071258.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/tev36je69sqsre9992kgnhrfc2/68101452459.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a5124f389---75080518086.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061803004771.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_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 10800 bytes
SHA-256: e878c508c9797035ac9381b7443b41144a4f004d64f24653f55cb39037a14c03
font_02_sfnt_off00010ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 18020 bytes
SHA-256: f212c6fa829f81501b52a1ddf184cf5a661ff3efa7d063e610aef0b642a091e6

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