Malicious PDF — malware analysis report

Static analysis result for SHA-256 9580cbd6d2f06c69…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 09:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57e9e2d97a2e286f9c7ba5c3178ddb68 SHA-1: 6bcf722b4886cccf234aa4699c825fb30a25a6a2 SHA-256: 9580cbd6d2f06c69e449859c859e8c57cb5b1dc7dcb99a6a7ae440decdc2fade
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further compromise. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=feet+position+for+irons PDF link annotation
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/cd488c5333a3fd536c679e5d72553f08/kupipegidikawo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614651612e344---gegipelirajufopiguwag.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/zugeremozanowuwelepu.pdfIn PDF document text
    • http://winso.tw/userfiles/file/34293196099.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/96018914175.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/ferogifomor.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/34751833572.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6uegifqvdnl5nl2spm894plgb2/55191813073.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/mejadutofudekipud.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/15434186619.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/zezifufewawufidila.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/zerog.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/fb1b9e87cf25482cc20c81e27962a780/18173969335.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210911_7DADF4EF6683E6C8.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/povowakuzavoj.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/boxivikatejigatosev.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b1fd72959---87570358489.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/xisodubebipezunomede.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/46255429522.pdfIn PDF document text
    • http://zimmerei-possert.at/84687759165.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/23029127388.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/44647919281.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_off0000ebe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 16628 bytes
SHA-256: 07cf23248233dc70fde96b902eaaac89af49a60d65225acf0a032d6baaed0374
font_02_sfnt_off00012ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED9 10120 bytes
SHA-256: 645f0fa852821193e006a5b959ffe22a3f11e7948dbd7caf1c71c70a5dbf99cc