Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa43261be351aec…

MALICIOUS

PDF

89.8 KB Created: 2021-09-05 16:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4bcaa3ead541d0d6d951392219f3b4c7 SHA-1: 93ca75103e133c3f731d9922edd87de54a73d86d SHA-256: 4aa43261be351aec61655f96936d9a3ac5558cb83b46f4c5a93dc8ca7c6be100
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous compromised or disposable hosting sites. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16112d814caec1---90294208150.pdf In PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/86889371699.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/wigufelufedupezokevuxolel.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/74346701457.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/woxokoduteboralup.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/30257ba6f26b3f1d23884b2bad63aea4/80076009989.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918a6a2acc7---tekoridigifokugiposonav.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/4197bc6f37bc570c0fb687582f4f174c/79858855726.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/diujvdain2qg2ea0sklm3t7uqt/walopilenazumiwiv.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/fefomir.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/9387599966.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/lipidimamafibi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7eb07417ad2de686bae28f38cfe1250f/vuxozigajasal.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a164fe61b3e---34853112687.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095cf32afbbf---90142064131.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/vijeziniw.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/60394be9117d27aa77c37b9aa6d26329/67221286757.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/xilusejopulodi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/4ad3a903e501ab1943060017e34e82b0/rijanufeduzonam.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6n8vfmd68psaqic8i19h75s3lr/58374048198.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/60292212681.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982218e0bd9---kalusowexabogixotuniz.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b6e4d3792d4c0ad4ea266e3e01c8fb36/jexarujajatakidaboxi.pdfIn PDF document text
    • https://attack.lt/images/files/falotowerotixupebo.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607079bb1e188---radukomikozujeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=literature+essay+format+pdfPDF 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_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 17600 bytes
SHA-256: e4623524d3d806e7d9bfbee34ef6a6e15760e66993aba2b43e07ef94907f8df2
font_01_sfnt_off000128f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F1 10680 bytes
SHA-256: 68bbc3051d4021dde0f8192ac49fe8cdcc3621c640edae4e8add1d51e2d4496f
font_02_sfnt_off00014187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1