Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3710110315161b7…

MALICIOUS

PDF

90.4 KB Created: 2021-06-28 17:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f1ff208ba793558c12abb66a0cdf855 SHA-1: 3b84aa5dcb2f98790c64ba635bd7c8bb02c7c8fc SHA-256: d3710110315161b7c14ed08ea7c3071a1c981cb91125150b6e4d2ebe5641b2e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is a PDF that has been flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or redirection attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c6a73948e---32561546744.pdf
    • https://eprobatdz.com/ckfinder/userfiles/files/8631305760.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607780dd4dfd3---36889126699.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c64bd1e6---93543695097.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bb3f676ff---javumogixuxodujox.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe4727682e---fowawulufebudexupo.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9660d9315---91040652104.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c338ac5e244---85411343880.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/e5odvtq5b4q2lekcubqlkc2mhf/92893135484.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/newabugovutapop.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/69130185269.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b2350679c95---33293704683.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/sndao42ko6lg5jp2ggdpq3bu55/35190803425.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/oicbndh85abr5tbn7sqan0tik7/2183094842.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609207b048a32---jajepidugepumowiribapa.pdf
    • http://www.ecostroyservis.ru/File/pudavizig.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b891b5722---44633468601.pdf
    • https://open-call.fr/uploaded/files/timeposeduxatudeto.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/837dac6646906d1bda02acfacfd9faf3/41308343153.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e0094191d---23349313829.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16075d388cb933---44194293562.pdf
    • http://armanetti.com/images/mediwunirotola.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/3cf5a66207720d5d66c3563186a35fc1/zupipofor.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9c95887cd3fe3522073dda8bb5b6c68b/pagutogid.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=causes+of+body+itching
    • 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_off0000fd67.bin
9c60a2268ae3351e673a1835ba8626fcb6b1127fabb2f9aecb81ca1e9ac8275b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 10996 bytes
font_01_sfnt_off000116c6.bin
38fa4220612ab077cc24f93902c10ff6bf48f6390735c1f7fe3e596244c5dc9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 16932 bytes
font_02_sfnt_off000142f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142F4 16792 bytes