Malicious PDF — malware analysis report

Static analysis result for SHA-256 a091d29c628a4147…

MALICIOUS

PDF

87.4 KB Created: 2021-09-04 11:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f332149173e7da8fa9bba0408dca835e SHA-1: 5b54be21eb9a29773e91a134a884997cba95d446 SHA-256: a091d29c628a4147b9277c78b7679c8c81132ffe5cb8fa6063a485de08fcae6b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/levazekosumugalaj.pdf In PDF document text
    • http://librojuridico.com/aym_images/files/26303925608.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/rozoj.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/46558393147.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/38576310948.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///ziziwetizewetuxunirabu.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/zafegovenatetifokibu.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/53614456671.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00b781ae4b---26929550748.pdfIn PDF document text
    • http://scarpatti.com/files/54496733083.pdfIn PDF document text
    • https://vestol.bg/files/file/muzimuwisusulofepe.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1f2bd4408---temefowomapovakozix.pdfIn PDF document text
    • https://phm.vn/upload/files/90011720169.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725d005a31a---94879797825.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/3b5a9efc9f0b0ea4900564218101aadd/nuximixulazug.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/34636803257.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125321a3ba54---zexupubidamunaferi.pdfIn PDF document text
    • http://emannsltd.com/userfiles/15952304752.pdfIn PDF document text
    • http://bbgannualseminar.com/clients/6/60/607ac775fa755cf068047886b2bbe24d/File/22136364208.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/nesirufumopa.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/vekikalokagamofapate.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c6599dfa19---90591092700.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/zodedezetelujubofo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adb88ae490c---57678056268.pdfIn PDF document text
    • https://castel.ro/userfiles/file/20954963762.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bda4453736b---sumalotubemerafijajog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=audi+service+manuals+onlinePDF 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_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 18396 bytes
SHA-256: 33ff30664fb6e1b3d56574dd5d0d026975b87c3302ebd59662277b25cbef70b0
font_02_sfnt_off000137b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B9 10580 bytes
SHA-256: 107153eaf66484eaf732370ce42f66add61b1fe86409060f19a66ef2239dd4e7