Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d3a0544da2fbff…

MALICIOUS

PDF

85.7 KB Created: 2021-07-17 04:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4289449a334291d8aed952c9287ed793 SHA-1: 2ba1869a2773fc7e9ce3cb3abac26cd7c0cb6480 SHA-256: a8d3a0544da2fbff0d866cb93f26c7ebc46b039f0d323d956e2d6e59912f2215
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/eqikgk49us555i455lr79n9v5q/jugurokemagonedalezujipet.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca37658c42---61150090113.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9e5126f97527a4b5b42759336c714cc5/tawolifafavekowetubujig.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/60759910562.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/029qe99tqu7lavgng7dr18lq95/8543953497.pdf
    • http://nelly-design.ru/upload/files/kufivova.pdf
    • http://shinex-auto.com/userfiles/file/36591036698.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9a2edb6c2ffecf85460dc6888d6177cb/jemudabekojegivom.pdf
    • http://yasaitogo.com/uploads/files/wabinudinunavudidivazixin.pdf
    • http://tafgambiatours.com/userfiles/file/66960685881.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/42f209b30f9d57ba3e5226bb939d93a6/patub.pdf
    • http://goref.ru/files/file/29050008919.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b8914ea13---92496937465.pdf
    • http://lovelyspa.net/ckfinder/userfiles/files/gafafaneduzi.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c43073bd5ab---kapovuginutulonuzilugitob.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4e737e12d---22323503743.pdf
    • http://linkipt.com/_UploadEditor/files/tubobutokodid.pdf
    • http://alimentosldm.com/userfiles/file/fiponimavuv.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609904b3c2686---mibanabufilomagawelok.pdf
    • https://nnkcreations.com/userfiles/file/54782987238.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607387528aabf---12768307039.pdf
    • https://vrindaindia.com/php/joseph/uploads/file/fexunaxakajan.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a7b391b61199e38b4614ffe919fcdcac/2861119718.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8be2a5059---92270691377.pdf
    • http://ufnk.fr/app/webroot/files/file/45370053069.pdf
    • http://beadsandsupplies.com/images/file/31911747693.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=smart+words+to+use+in+a+conversation
    • 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_off0000ecb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 16792 bytes
font_01_sfnt_off000104c2.bin
344708c1a34ec78eac7c0b2bdb24d8ec3e44ad9e11a6728be68603579ac92290
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 16788 bytes
font_02_sfnt_off00013069.bin
ebf3cc86a6c4f429cb5a7e880ef6609dce98313774014670b444cb085887f19f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13069 10812 bytes