Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d18cb5d95a4d45…

MALICIOUS

PDF

80.5 KB Created: 2021-06-25 21:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42ea21eb8aee85a41e8becf68381a8c7 SHA-1: 782260e1bc79d0cf5d605fa938bada0110e30411 SHA-256: f5d18cb5d95a4d4525cb67b9063d7d534fd3df2a89443a9581f20a917ae487fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm that points to compromised WordPress upload directories. These links likely serve as a lure to download further malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/sogpuopvrpq06nthvl6ki8fjmm/kobofumadofu.pdf
    • http://ilturismoinitalia.it/userfiles/files/54407645960.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b776cbf05db---70934845471.pdf
    • http://pokemom2.com/uploads/files/98434737696.pdf
    • http://capitolmetrophysicaltherapy.com/userfiles/file/29760341681.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ccf717f1133f457f424732eaa41ae201/kolilalelafanuw.pdf
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106111150350649367vmyh5.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e08cc72eaec01a89e8fbeff6f0de57a0/71725084832.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9ic3bmrka6bp0poh0h4rus5ii5/88513899032.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/1a7d6e4352bde82048dfab619f54c9be/50055354026.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e95601cd3---3022593839.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4137c62f---jaxotijulafusasoboza.pdf
    • https://service-panev.com/userfiles/pobasufidoruzew.pdf
    • https://ottenburger.com/userfiles/file/runasuwasabipidipekemuku.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c67c36c2ecb---mimetarinosizu.pdf
    • http://acpiindia.com/userfiles/file/57707326681.pdf
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/52445793081.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ifiqbg9m5ihkvpbvrnglll1ulb/12491941013.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a923ee64842---zumopisowenowumeje.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b0e455fde4f8dac800535ae6d43ab3c1/somaj.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb89a25d53c---42858514026.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qte95lvi4seujd6bh2c0u0ksn1/82018108580.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc92b0496---13106754697.pdf
    • http://luckdidea.com/ckfinder/images_store/files/werodujelixebumu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=thermodynamics+and+electromagnetism
    • 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_off0000d3ec.bin
68d9d0c399e4ea5fe1aa6f0c4baef9362b1ece55eb7dcdb268eb8f93ce5c5756
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 18192 bytes
font_01_sfnt_off000103ad.bin
949d5eb5faf3750c89c356bd0e5d18d2365df9197ab12228454550ac2153ac2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 10896 bytes
font_02_sfnt_off00011c89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C89 16792 bytes