Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a89f471d969d193…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 02:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b3f1d203a8d8d5d5b3f8af6990c4415 SHA-1: 35fc19f50ae1db608d5482448b4361ce15e124b4 SHA-256: 5a89f471d969d1936a1788c3b13abae686a564be7c1feab090db0c4025dee570
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URIs, many pointing to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URL analysis confirm a malicious link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://zaragozadenoche.es/upload/files/97743464459.pdf In PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/24eb1af2bf3689266049f6bcddf1ba45/vudisezuxutamozabofopi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110f9dd932d9---15868681148.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16127575d0261f---30248728321.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/48334980468.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f9cc500a3---8719049676.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/518955b8e62b284204b6c8fe598e1912/natafi.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d9627d107fea3b22862fc97be5157c34/62434496148.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/rapunaj.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/3c064d3e7249df2ec5b55aadff33dcd4/nopuxirumumuserodow.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900ddcf0237---36424989895.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/saxaxazesufeloputipasute.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/82357200749.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/56891333716.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd85f132a---kelatefe.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/wipodivoguzofududirus.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/49127096843.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/23243489908.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/33224656969.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/48311391379.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/22adbab6254ebe3e586aebe5273b5e9b/kugij.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/bizuzubaz.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609844d09f807---jedixijejizol.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa69de6415e---tojivuvitigajikojiwaw.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/46962466801.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/59310473088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=kenmore+beginner+sewing+machine+11803+instruction+manualPDF 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_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 11548 bytes
SHA-256: 4326d9f4ccbf21c3124048156a123bfdcc10a2294a7c8473651a1d3891b9f188
font_01_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 17720 bytes
SHA-256: 8167ba626c981955c5244d4d0e074bdf2692f60c0cb950396faea07c9296eea3
font_02_sfnt_off00012452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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