Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2526862abf91e78…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 22:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e530b87f9eb12a5a6281a7f30964730d SHA-1: df7d945dc47f86256e540055673ef3d42a71e968 SHA-256: a2526862abf91e78c81db281d91177cf3044e23b8819638f18ca52207317c5ab
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://krisoc.ru/uplcv?utm_term=cool+letters+copy+paste PDF link annotation
    • https://delphin-restaurant.com/ckfinder/upload/files/75320516988.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb640d4ee---lugazufunifaval.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/45727148910.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/43013365969.pdfIn PDF document text
    • http://liyangah.com/Upload/file/dirijenogafoguwa.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/82892346146.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bc921211b---kelewisisuwow.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/450395b849dc55c43611945eb2ec470c/57512826486.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/punepurorow.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/luvemowa.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/6055508088.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/lowezepatokotevetakumil.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/93715347714.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/66761387557.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/0b2e9c597cdb221f36054ea596ad67af/bijarogu.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/tiredirobewewitulubur.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316774c6e2e---zamusokoxa.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/rikigarasatesugexok.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/mugodafafefikutixexu.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/97635949640.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/30407558758.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/92854783548.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/renipipusimirafade.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614af74887d1d---xavebuk.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/63983068987.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/323059332.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 10316 bytes
SHA-256: db4dd6d8199ea17c738c895d977f965dde27c45a223485f5a80521c4d64694ab
font_03_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 22860 bytes
SHA-256: b71586612b56310799966dec9cc425a3a950a722bb8bba8c99653b69feeaf717

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