Malicious PDF — malware analysis report

Static analysis result for SHA-256 071c348e15fdc5c8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 04:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 20f7502549f04d0f4315c6a8b10f958e SHA-1: a66192cef4673f712d2f8a2889677ee5006dca45 SHA-256: 071c348e15fdc5c82d1586b0f6e4c1ddce4b78c0f2964503605790c008ac1e47
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://marwaautorepair.com/nbloom/fckuploads/file/jusajadowewis.pdf In PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/32310384162.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/50145296202.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083264ce26a1---pulubiguxasasiwo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hlinqjn1jvqk392eh8tue0pk6i/venopep.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d70193583---pobifewobalilerewivo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/da2eb27b5dc9c0f348f985a52fe3b976/diwix.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e4e62c28b---11512485350.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2c6fa83bf267f3637398c6ce93d32e58/88908379532.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/41972988632.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c7789f5f7---muliliwesatesudiwilim.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaef54d84d---72844979271.pdfIn PDF document text
    • https://kede.org/userfiles/file/29254481175.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/41419075339.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9910f20c2e---95488941209.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/a0524353eeaf1b7afbd43d98569d1b93/xolimis.pdfIn PDF document text
    • http://desertofohio.net/clients/4/43/43f38f6e2239b09326489e1ba67fa1b6/File/39080463412.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b0317cc63---wedusudos.pdfIn PDF document text
    • https://actorconseil.com/files/file/zutok.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/zetusapevimigot.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/18036018924.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099daf92e2eb---12918996354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=caracteristicas+generales+de+los+carbohidratos+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/nexivadogimekapaja.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD011 11068 bytes
SHA-256: 0fefc88793d36602cbf9095b8b28b132818163a1e58f944d0ba078971b8be32a
font_01_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 18488 bytes
SHA-256: 3f26e968a7920cf3579ef5a261a6165b10ba006de77964f94b08bdda54288166
font_02_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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