Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba5ba7dd55c8159…

MALICIOUS

PDF

86.2 KB Created: 2021-08-14 08:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb9de42e1758e3d2606e56952e55b02d SHA-1: 2e83471253139ee698e0b30c33b0ecb616d597e7 SHA-256: 2ba5ba7dd55c81596f7dbab0b47db31040c0fa4b0a108386b479310cceacb737
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The document body is heavily obfuscated and does not provide direct user-facing content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/uplcv?utm_term=how+long+does+it+take+prevailing+wage+determination PDF link annotation
    • http://edumedcare.pl/upload/files/zomekosejabufamojigebudib.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/zajif.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/xofesovajixuzilivekagir.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/95678076340.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/80315312200.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/fijiwasegumorubezub.pdfIn PDF document text
    • https://network-italia.it/file/lejawi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609255c04a011---26171082721.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d88cd7cdd---39134478089.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106c961d3e42---pudefabizasisobirubozinen.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/muravukegisewevafumi.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/muzivuragew.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/vuzuvaloriro.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210519130942802883066.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/53417357032.pdfIn PDF document text
    • https://zzhqhi.com/d/files/90876855686.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610069b685c18---69195239380.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/gewalukolux.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/87565355455.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/29bb21057b56e36aac46ad646b06e9dd/zotixesanubekifemo.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/bfdccap13uomeqiph3udh62hbc/bobofovimiziwotumo.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/kria8ko7i7q76tmsn0cbbmqvs1/vudopa.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/19104696038.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/genuretagad.pdfIn PDF document text
    • 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_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 16752 bytes
SHA-256: b43d809e8dee7bc6745db572f3b1dc0fe2219a27a69a549b3ac7f0bf0377b665
font_01_sfnt_off00011721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F38 10968 bytes
SHA-256: f2bc6edf7b2f90470e8a641b6151541e97084ee5bb6929c7fc914b1c20ed4340

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