Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba287b377276c0e…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 22:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e2e169d73386f83a01f6238468e43c45 SHA-1: b7d15538b7b8b22edd28a8e0ae38a7a22d6fa2cf SHA-256: 4ba287b377276c0e1541a49ebf827e755e9f7113bb8c3a62a1b8ae14337a62ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to lure users to compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dhs1959reunion.com/clients/871764/File/99996881065.pdf In PDF document text
    • http://magendans.com/imagefiles/file/17504569823.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea080f112---85162138947.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6cf6d3197a42c8df16dcb6f2ecebd1af/40422059572.pdfIn PDF document text
    • http://darstin.com/userfiles/files/wuwuwifegudoja.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834249826cc---89902787130.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c16b9fe29f9---sodogamoropi.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/43836238865.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/41321649490.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/c2654b30dc9b9e9c5758fd6d1124f37f/dakalifogetadamosafonuv.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87d87e077---geselojutanawizema.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e90308e5c5c---31766913497.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/zagemav.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107a955f3f3a---redonemekenobixap.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/33276568554.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/roxitanoguwanudog.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/55950282079.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/e89da50ea40e2bf02063908b3e64401f/16898309501.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/98537729692.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/nsgacachec8bbrvc9c6p41lkk0/zowesepuxige.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161147055ea6ff---jurigu.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210817004223.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/80116548382.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac283b9da0---81915489705.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/50971885263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=esl+english+through+reading+pdfPDF 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_off0000ce21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE21 17368 bytes
SHA-256: ccd9cf520d5a01e70e51fb33e00f88ff2469bb1d32f058c8d7b15c0526b943ee
font_01_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001131a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131A 10860 bytes
SHA-256: 4cef87edeeeef0ed85400119a34c85fa498fe4d6cf7c385b58f44a601b30b89f