Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd31bdd629e0c37…

MALICIOUS

PDF

107.0 KB Created: 2021-07-14 00:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6cd540c19bb9b9cd02b3d2300949a64a SHA-1: 3735f591ff59fcb888b35857a2cf251da9d57fbe SHA-256: 4dd31bdd629e0c370c9951922fb5f9f27543d862b807c3be71a476b51e62e5d4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=mercy+medical+center+medical+records PDF link annotation
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/7224987362.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/230d22a8c1ef07e763d925be21a8997b/lesegaxaluzoseradaket.pdfIn PDF document text
    • https://noventa.cz/media/files/file/fetirewaleforovarowezizi.pdfIn PDF document text
    • http://hylevel.net/Uploadfiles/files/65637220107.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juwilegigije.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/kajigotewatowifafofus.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4b64695a---dupagepe.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/wogukefi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c9b12580d1942db0bf74d748fa0704d2/46967383853.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210619001432.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ijorueoeramvs647vf1hgbh4k6/19543463602.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d3702a66143---legatorogikibeteg.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160806978c1450---rivegeximezu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b768f06baae---71624056859.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/apd7tp5r3go9vqo4h1kdo5qtn1/girubimuv.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4af8e3c7---66774699170.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaae254d96---11585701396.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/nowiremosulidifusen.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///202163932498071.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96aedc8f15---62236444435.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/segitalozapuxiserud.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16080882568cfc---44552247956.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14114 10640 bytes
SHA-256: 36d1f08c14ece49aba80da8be1ebbf18dd9da6098d63b06ff4aaf0c9209fb1fe
font_01_sfnt_off0001596b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596B 17280 bytes
SHA-256: 354dcfe71a29fe6de9f123eca8d96fd324ee974ebe227fbaa3a02c2169c9139a
font_02_sfnt_off00018699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.