Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ac81381aa70160…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 22:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 728ffe2931c545c2d7a698550abb84ae SHA-1: 43ce548872368a398dff06e8b5e503bfd13c5b35 SHA-256: 94ac81381aa701607ca2806101d0afc93674570fa9c28d2247733c8c714e5ad2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not provide direct executable content, but rather redirect to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bdaudit.ro/userfiles/file/zetitobuzivaxudamonamajip.pdf In PDF document text
    • http://adice-area.com/pictures/files/97281138455.pdfIn PDF document text
    • http://coolscape.info/images/files/90309778086.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/77699507902.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/werimabuxeluwefolon.pdfIn PDF document text
    • http://finchamauto.com/pics/56026024945.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/moxifafedugajewa.pdfIn PDF document text
    • http://master-br.ru/img/file/xomagubumede.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/75bf617ecf8faa44634ca4517b5d8eef/1553548682.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/13195616177.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/53271678038.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a415c7e789---rolinemokin.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/55332140103.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/xosimumumepexexuxofawokik.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vdencss8rl22iv6oumsjp99m46/nunobip.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316c1a7832a---76328360675.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/58770110040.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/80275554823.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/68867fa78652f9e221c2f41ea3f49d00/nejifijufutokokomalufikag.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/37738589823.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/39088993535.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16151250350d94---27169823145.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e650da0f5---69753798254.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/98703878060.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161332d243640d---woxutubifolosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+hd+games+offlinePDF 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_off0000b520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 14672 bytes
SHA-256: 81cde48232193db3b10dde562de858db80e0d9c07887e650fd808fd0f953833c
font_02_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 10684 bytes
SHA-256: 811cf5c1e17804b9fce3b676b84ed4fa3d88bf3e2e01c57d6ad8309dd616f01d

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