Malicious PDF — malware analysis report

Static analysis result for SHA-256 1183fe9406d8122f…

MALICIOUS

PDF

94.8 KB Created: 2021-08-07 17:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36afae5435f5649c0fcfd0fa7079d280 SHA-1: 06aa797a80e1e656237056bda43b1e5eb3de1399 SHA-256: 1183fe9406d8122f225de143f55a1f238eb8c29db82e948b9f68a5e11b62971d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed for SEO manipulation or to distribute further malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://oryginalnedekoracje.pl/userfiles/file/lewijeres.pdf In PDF document text
    • https://bakwanudang.com/contents//files/40995895376.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/6998a18eacd394c0e5f3cb65a1292b1d/55246048241.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/zomaxuru.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///75644359094.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/donamimagirije.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/bopulowefojetogino.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e986252f06---lufofutixux.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/3rakjbjtfphun7p1qhjdphcq91/vipejekatuzulepino.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac55d145f42---33384513203.pdfIn PDF document text
    • https://parkettworld.com/upload/files/20734298694.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb2112db18---rutoropop.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/73437303665.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/71473781745.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610b55d352694---zitafikizitilozedakesaxe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85c9dab61---33800229024.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/fd02ae1a00019f4127b822b7f5515ba2/40232948618.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4c8442de---pelosamuxus.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775e7c5e649---torizamenewetuzo.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/jipuv.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c3fa95e956d0f7d1ac2922f483b8453f/8283941150.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/fowivuroboboz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+much+does+a+baritone+saxophone+costPDF 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_off00010874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 11152 bytes
SHA-256: 594f7d42250c86af307038749b5ce8c208674833d289cc61d0b06f0977528271
font_01_sfnt_off0001222b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3D 19336 bytes
SHA-256: cf263d4f8a1c3856f2ea764b37fe90d111218eeceac424fdd885916f805f2c5f

Open this report in the interactive analyzer, or submit your own file for analysis.