Malicious PDF — malware analysis report

Static analysis result for SHA-256 8931353f7b1da0f9…

MALICIOUS

PDF

93.8 KB Created: 2021-07-31 05:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 9f7664d3bdd0795232b60d7264ca6e97 SHA-1: b67b8628aa264b1ad9bc68060f53468863b2be74 SHA-256: 8931353f7b1da0f99a697cb424b3427a48a9b0343572b209242e2bab021d33ae
156 Risk Score

Malware Insights

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

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 compromised WordPress sites. These links are likely designed to redirect users to phishing sites or download further malicious payloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d03e2aef86---3010821471.pdf In PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081c29a57bd6---nubumamifapaxodukolizi.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9e7abc6bf6087fb43b752d434296201a/zonar.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4a62ea8ea9570beca9ef85a01f6402dd/24079544703.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63c7d3fac4---25147145746.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609191fc8026e---norofawuwusonudi.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/16/file/20210516_184131_130.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/sejaw.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3db3702d98bce8719c01a95040db5b1b/95711019261.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/zozamop.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/b1534c01e3090d207fcdfaf401185088/64101195285.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/42881466170.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6e46947a4249f3b8c8fb88c06990d29b/vuritoja.pdfIn PDF document text
    • http://akademibt.com/resimler/files/87996506967.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/0ac145ab5d6d51357e5c9306b5949b55/zixagewetaverugebilasoxe.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/xoredakalakuxugelaxemajub.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2d5e8a261cfbf52c2ed691d16b8efef4/18359846847.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c535d7012d9---27469303346.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160864ec5ead6d---davilad.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/buxigosusomewenuxasek.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/f0b7e40d761953555e7d8bdfa99c32ce/15118181261.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/64456772326.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbfa0832a0---bebegutinopupaviguwese.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7abe5da397---34505153527.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a40789310be---12522988740.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/mezalikitisowigojotop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ejemplos+de+sistema+nervioso+autonomo+parasimpaticoPDF link annotation
    • 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_off000105c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 18468 bytes
SHA-256: c46a1880a1023487a594fbc6fb64e37d9809aae6e52732e0fa0bb4fed5daae16
font_01_sfnt_off000134b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B6 10952 bytes
SHA-256: 0e89a9af204bb1f2d088925d12535629b01d3ee838268221ddadcc538050050f
font_02_sfnt_off00014e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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