Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7d8bb0245c74cf…

MALICIOUS

PDF

85.5 KB Created: 2021-06-25 22:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 202297c50aeb290833e3f121aa9056d3 SHA-1: e105a1312e0f539c029fec3cd4e898416352c942 SHA-256: bd7d8bb0245c74cfd41de2d4ddc619315d5daa6ac2d3aff782b94676ca4d0b75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=giant+cell+arteritis+and+sinus+problems
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa88f2e6e01---71840045460.pdf
    • http://wenxuezj.com/images/File/74142293361.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608323eabdbfd---tokozetunub.pdf
    • http://indel.sk/userfiles/file/92523554605.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac45f93f45c---46249819710.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/fetuwi.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/5rhhptcsrok5fe8gipprscj7r1/tedafagavedalipevoxewa.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b41668191ad---pukososupedu.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5307663137---87778572485.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/m13ul4pm3u8t2qniqo5aht2194/89071505406.pdf
    • https://vmwarts.com/ecovic/file/pepomuxumimumexiwezit.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/jjbo3c0tccv16gf0poq21juk80/13301688839.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/21e7d62efc75674887a4ebe01e97f68b/32602597768.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160961c31d8999---vaginavexo.pdf
    • http://ncabhsa.com/clients/875427/File/vixaro.pdf
    • http://alexlunacoach.com/img/editor/file/76478442025.pdf
    • http://bigsvatcharasith.com/userfiles/file/23263617775.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947c33bd5d6---45329962179.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc255a9cb1---44841322594.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160871eabaddda---75836678727.pdf
    • https://masini-de-ambalat.ro/images/userfiles/45740725580.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7ac19b5684acd87480b282a6ed248b55/getalesajizutuzeni.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b309ea337---jejatonagigizekorapig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee28.bin
685dc7191084f1571124f37e4a11ba8466eb5fabe7e89142e48a23ad7ee00308
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 10956 bytes
font_01_sfnt_off00010751.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 16792 bytes
font_02_sfnt_off00011f63.bin
d23bb6a73a8510fcb86f74e324c9a79c36f5034a3aed3892a6c3f5b1c74bb81f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 16100 bytes