Malicious PDF — malware analysis report

Static analysis result for SHA-256 2862e21ed8c9265f…

MALICIOUS

PDF

78.1 KB Created: 2021-09-29 02:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 97f866798b4637272f331ffc670cc31b SHA-1: 0ecddc4a3b21964359a2062c69bcdda1ccca4ee5 SHA-256: 2862e21ed8c9265fc3f88426563db2799472d8739c8c4bdf7bad8dfacfa65af1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress uploads. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=how+to+hard+reset+moto+g PDF link annotation
    • http://eco-building.cz/UserFiles/File/mataxifajonopadetadu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137aed4ecc9f---51242482068.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/kapewigofa.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/xujazew.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/61308486558.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/90224303179.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/bomenanif.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/30257832252.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/75447225082.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/gisepavalewov.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5efca645c355c202da072c8fd4dfa620/gosusefenud.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/eaeaca61546a569b28d39494606249eb/juzutilemozesazusovonup.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/gexoj.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/93352499028.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/wixefaf.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/sumomulebukonewemalem.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/8465469107.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/98373495484.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/54678765001.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/gopakudadisagoxetewo.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fivavutiwotidox.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/34405266401.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/92500848647.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/73903116250.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/mofusivaxuzozuwetuxa.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_off0000b6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A9 10532 bytes
SHA-256: 3ba79a5b7a6e32e224f9e4240f2f9ec264a6688d76b5fb340d7984b728533b5d
font_01_sfnt_off0000ce83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 17964 bytes
SHA-256: 48d4902bbeb2dd6e6717fab11be7ed1a066fd6159d0c13937f9f598e78ee3eb5
font_03_sfnt_off00011460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11460 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684

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