Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aaaa47f2bb71a9e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-01 03:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82230eeccfc98a111a230ab1749594f7 SHA-1: 307bd6efb91d72690316a44a5dfead3a44af5d33 SHA-256: 3aaaa47f2bb71a9e8a227407a18429f4a5d5207ac7ad38be3f521ab000837143
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a large number of external URIs. Several heuristics indicate that the PDF is part of a link farm hosted on compromised WordPress sites, likely serving as a lure for phishing or malware distribution. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/flr77kl26jgc83qpchkd79kmg4/lapunetedudasujekesuti.pdf In PDF document text
    • http://sewakendragroup.com/userfiles/file/5014490220.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160761443826d7---boximuzaxugugabim.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/9b029aa6f91d78a225301ab4dbbec92a/bunagutafazasesiwewepol.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc891926a3---kemutilidufotidowo.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/fidogokogosixejam.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160810b6a77903---66345582761.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f0ec9e9816a56383785539edcce4aba3/wusiwire.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/xekogiwulatuximole.pdfIn PDF document text
    • https://nasselgrundet.se/anvandarbilder/156/files/ravelotufutifivedon.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/vikujinuluzoxu.pdfIn PDF document text
    • https://0900107678.com/upload/file/vazisu.pdfIn PDF document text
    • http://llux.vn/uploads/files/dibiramarosugijaxajunap.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/68544020757.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/33718026128.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/632aa01b9d303eff615805a10ef0d4fa/buwixewovogirudim.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/zivorevepetiwizawet.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/zofowojebigotugetawuwum.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/47614523793.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/83528069707.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/h5jafbkftksvu2gd76kvoimm87/lijilufotimefepoza.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081350de4e29---22269749830.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/16799092139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=some+things+that+stay+2004+full+moviePDF 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

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_off0000b5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A4 11236 bytes
SHA-256: 2bca264c0a9e2424e03074737216690d69110e79f17cf9c6b742a9103177ff97
font_01_sfnt_off0000cfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFED 14756 bytes
SHA-256: 4b22cbf3d40acf47870562bcb3f175ebb6720492cab4080da07f711334a36e40
font_02_sfnt_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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