Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e8dc5530a37b67…

MALICIOUS

PDF

84.1 KB Created: 2021-08-24 17:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9684ce787a85065a392b2bfefec83dea SHA-1: 7ffc4277757383b48cff5b15f8955fb94f204189 SHA-256: 34e8dc5530a37b6797aa36ab7d06240a1d7f9048666909967bc83c4047b59939
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The presence of multiple distinct hosts and the use of form-upload plugin paths indicate a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baeef4e83ce---nipavubekusefuz.pdf In PDF document text
    • http://lideparts.com/userfiles/file/1624154033.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b5abb9eaa8e5464f5e68fecc5bcf6618/ketuzaluvibarafadum.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1ad8dbbadbf9f0183272a540ef7aeff0/60126926224.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/wubaluvafilubijavikopula.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/6334ba28f66d9c558fa17a5247e18638/fegikidujawadezupino.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/af21e357e130bf08752b2375ba30bb93/69809838610.pdfIn PDF document text
    • http://change4best.ru/upload/file/71820656902.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/34198588637.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb473c4773---33331353233.pdfIn PDF document text
    • http://ezibra.pl/upload//file/8189278364.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/92c850928b7fcd2f383de65164c90c42/49528296701.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b38460eb0d---95111938432.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701a077b1ee---diziwu.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/56166364872.pdfIn PDF document text
    • http://nstoplana.rs/ckfinder/userfiles/files/dofajotitebuwuveket.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/61007140394.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7494d93f59---26433284169.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/993ac88b2325a70ae81b1f3aea894a2b/zixelizune.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee47ec2b2f5---60119795843.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d6f4a4dd2dd1f800e90716cc6d93e59d/lafavopukiwoxeribux.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/75450684643.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/worakoxogebibozokenawuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=java+microservices+framework+tutorialPDF 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_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 10728 bytes
SHA-256: e4289c6f513a457e21e04e9415771a9bdf696eb1723d1ba0a26d3951e5872526
font_01_sfnt_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 16484 bytes
SHA-256: ba2ae9038dc6719fdd35b0b04416bd94abedce2e5f5970b25f96f051a936755f

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