Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2dee67eba73704…

MALICIOUS

PDF

71.3 KB Created: 2021-09-07 07:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 681be7931c8639be35f86ef664b91e8c SHA-1: 0a53cfb9bb347680e1a4828a8a37d8102bf2ca91 SHA-256: 9c2dee67eba73704be0a4405896f79a27cf5554eee0e99d0b3a5c41bd2423c3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many with UTM parameters, suggests an attempt to lure users to potentially malicious or phishing sites.

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 https://huntic.ru/uplcv?utm_term=euclidean+algorithm+for+gcd+pdf PDF link annotation
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/purubedag.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/35283643988.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2t380n6qnhji0hrhrtreied6n5/buwelazaruguvonosa.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/caf0249968833dcb1b8e0b85f6ac0c7b/pukezekebakanefobajuk.pdfIn PDF document text
    • https://eslms.com/userfiles/file/penisexinenubi.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/78783520824.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c30d0bebc3ccf5dd8d50756775332e3a/77758832379.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/ca8a6d36026cde0b14bd9c8ebcc283f0/dininugelijinesakiz.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///fidozasu.pdfIn PDF document text
    • http://grimastone.ru/files/zofuganikobume.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612641dc32c43---kowerixuragakevojodo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4rv06sf757kr7aidq07vsqbfdt/vilemorusijizop.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd94164160---68294861544.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/sififadiwarezu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/gibemifizesizobawinozavun.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8e5256ad---41433386184.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/97096396521.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/riminigutesover.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/kelakusuzixanogil.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/lorojukivadugudivinek.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/78292633267.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/16359561388.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83f023b310---66152070087.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ivbh1tdgfl33pl9btvqh7q4hf1/35603976177.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607172f7c4cc6---gimazenenafozijebuj.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_off0000b8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F6 10980 bytes
SHA-256: 90037d4773c5f7f7c93f992e0ae52bf955435dc98f46a6ccbc94e200a50fed40
font_01_sfnt_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 14688 bytes
SHA-256: 2009ff6c13825e5457e5de137bc07bb9dd3866e349bd4e32433a2f7bbb55f066
font_02_sfnt_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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