Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae318075fe7c92c2…

MALICIOUS

PDF

93.6 KB Created: 2021-09-07 12:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a6e83f2e4b0766bc7290279206369ead SHA-1: 0c4c630362caf5907a46cac19a91749bd6e8e314 SHA-256: ae318075fe7c92c2d7e03e871cc542e4976350aae312d693899b2f21bd9cf24f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability to execute code. The document functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and disposable hosting, suggesting it's designed to redirect users to malicious payloads or phishing sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs indicate an attempt to obscure the true destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/60bheqhn4fb5nvfjbd42f1chl4/27170231170.pdf In PDF document text
    • http://pogservice.ru/userfiles/file/94590189555.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/85ce00569adbaadbd23d51b4d6872574/pexexufi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089aac95663f---70103760338.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/vatuwetiwaxozidezubisunu.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/mevirodisoxiwinopad.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/35478ac35934350de5da074e54e26940/15310856027.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/9758079678.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/pubafanudegobivenadogoso.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6218d65b5---numedafijilosajo.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982fbf1499a---40998500182.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607561d9aeead---zinatej.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16115d4665fc69---vowedubodixupeten.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/19846828741.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/27819324503.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/14vhc39mn0gbp3msalbq83ugb3/newowan.pdfIn PDF document text
    • https://businesslife.com/content/files/vulalekapabopiwa.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/mfnae0pdnffuk2rv5ofu82adj0/84118626571.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/79127225490.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/67078706465.pdfIn PDF document text
    • http://imi.vc/upload/files/konutedifonibokepiru.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/90004648190.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/1be73ab13be6b0a9399eec8593d5452c/jiralid.pdfIn PDF document text
    • https://yuktogel.com/contents//files/bezenifadejakomefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=irctc+railway+station+code+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_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 10764 bytes
SHA-256: 259940143244de740ba4d265965204d880ed0718b19790b555769cd3d3c1479b
font_01_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 18448 bytes
SHA-256: 622877dec9275ff9e1a2cb4e72f8e9e2bc2bc6682b8d07a082a39f6a7958108f
font_02_sfnt_off00015082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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