Malicious PDF — malware analysis report

Static analysis result for SHA-256 834c5d0264e2e7ca…

MALICIOUS

PDF

89.8 KB Created: 2021-08-13 18:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3498d4b1e6c96b851f30105b3cb4a5b7 SHA-1: 74714266dff0d101910db7e8809768f3f551978f SHA-256: 834c5d0264e2e7cac7051a145116d10f43f9b8060273bea4704015dc4ceb93b1
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites. These sites host further PDF files, suggesting a chain of redirection likely intended to lead users to phishing pages or download malware. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

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://catamma.ru/uplcv?utm_term=ps2+emulator+android+apk+download PDF link annotation
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160772526e65a6---nazomogas.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8375920d---45265861583.pdfIn PDF document text
    • https://hssanesteban.cl/files/nozexelizibisulenipeberu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aca21d9a34e---76459755283.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6df3c674a27dc38c41bc92edaa1e375f/37022940227.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/7721329116.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/87171706181.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3cefc1ec0d05246bd26784114e0270b5/94635699549.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161000e522dbab---86040555856.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/2dc0342af3c4c008c50abb655ed8d7c7/xedesu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8d4d81ccb---govujeruzomotim.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/19740749940.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a29098d8abe---36539817664.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/66433006345.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078afd29a3fe---24052008584.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/fc5e5d5828c46b2ba7ad3170ba7e9ef1/63366308396.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad36b389a---76732656801.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/79872263235.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/97757593366.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e461341cb8---junuxefupobuwenipepipi.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/54927793191.pdfIn PDF document text
    • https://stopserv.ru/files/file/61429212568.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/luxowedujatero.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/forebijajapivabuwirisur.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_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 17748 bytes
SHA-256: 129c7a6c3438d9c0f0f54b1d252aa6135e78f9e257fc426f1b2c6113232918f6
font_02_sfnt_off00013dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDE 10952 bytes
SHA-256: 73e7f6a1ea2b714a1f0515301d0c5aad98c23a65c880df42d3e7d93bcf061e57

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