Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8dc90d2c0219c5…

MALICIOUS

PDF

90.7 KB Created: 2021-08-14 06:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2ce76ff38326e77f58d93598d350eac SHA-1: f67ac59da1b467576a11a90bd662949a1998c103 SHA-256: fd8dc90d2c0219c50eb37058e6ad1db1125e54601eaaf2976c678742f355befb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document's purpose is to trick users into believing there are new banking instructions, a common Business Email Compromise tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://dmychadla.eu/UserFiles/File/72983950879.pdf In PDF document text
    • http://worthingtonpark101.com/userimages/mutazuninepedidoxamabe.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/mikerevojebotemep.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5c057e295---71106761823.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/selav.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/zeromosoneduviwajug.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/8ua9r03tp6e9fe0e9fbg1vrbg0/loxokuxapowu.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jopemetinosuv.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f17f4da7956efa82d55e91ce68d27cd4/banimetagol.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/15cb089e0538d87ab326d48fba4d9785/boxuganavevobisibepejino.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/gobosuxajezevufe.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83895215679.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608af6c9ce8c4---69458674437.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/31328391678.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/lawales.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/fuworamibogiwijef.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/zomanawe.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/25882095695.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/53444131080.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/vuraxulorutixofiwiropof.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/26320969513.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ebvd52o6od15jamfnmqj4uv4vk/zaxazanele.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/86907040851.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/00u4e6mnhu80mqiv4obn5477sg/20360097187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mine+imator+free+online+no+downloadPDF link annotation
    • 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_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 10424 bytes
SHA-256: 0c99cded6b68c014be128793020e5f9ec5fa85c59d273d8eace032defea0e20b
font_01_sfnt_off0001123b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4D 18064 bytes
SHA-256: 76064a473b5f59a1149b486fb92bd29f05902e181c90ef7442dd18090101d3bf