Malicious PDF — malware analysis report

Static analysis result for SHA-256 77322bdd94bac9c0…

MALICIOUS

PDF

89.5 KB Created: 2021-07-08 18:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6155bfe2d0697ed6d99cd60e82a95476 SHA-1: 5d6cfec37599b6cdb523180310e8cd842e7474c7 SHA-256: 77322bdd94bac9c08dd33b48875130de947394f8da3c3cfd8f111a0fe7efcc7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and link farm heuristics further support its role as a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=what+to+do+for+a+slipped+disc+in+lower+back PDF link annotation
    • https://mecaniquekd.ca/upload/file/guxitusuwajodebijup.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/94856650135.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/00ce15b0d7f2f97086665866156fe3f0/nusamavorawikefedobud.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160718564a6e63---nurivabewumopazijuviz.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a704f439d4---70404259965.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/tulegizarijiwabavetas.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1ebd7b62eac61b282f156d09e79beb8a/xurapumozikux.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a77236d2---30235457617.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/11162657200.pdfIn PDF document text
    • http://vieclamtaichinh68.com/upload/files/jikosojudabiwu.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/31820530095.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210625094141927.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/napigesurowoduv.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/6f57f485a17d15fe99060c1161a6f179/zejotupetukanef.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/dv34bsv9vn2ulg064tjd8j80pt/95525087001.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/gh6tkmv8c5c55e15o02djrr5k6/gareseridazeli.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/furinanirig.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/pijuxos.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/61ab170b439f18c19c607d22d22477f9/77949459876.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16094789af0894---selusopabilaxo.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_off0000fd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 11028 bytes
SHA-256: df6d08d62f8f1196b07c9056da12fae57336b061e0cce4775e769e8aa3e071fb
font_02_sfnt_off00012ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 16124 bytes
SHA-256: 1a91564163f4f89bc27caa075d815a5b9d5acaf9a080d3a04ab8cec812fbc187

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