Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb5c2de136dcbb3…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 02:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 29cbc2f0fd0078d542cef6887f7da111 SHA-1: c90aa94218192a9aabd514ff748f18058547ac5c SHA-256: afb5c2de136dcbb3a09675caad130bc92c5a35f8f8db9fc54f1f0fcc80b4bd88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, possibly leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=sultan+full+movie+download+online+watch PDF link annotation
    • http://sksound.com/userfiles/file/89654108180.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/6172597294.pdfIn PDF document text
    • http://philboyd.com/55127506261.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/selunoxolikexo.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/jolufakafosiworovup.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/55341699364.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/vusiki.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/cecad702cccbe7318c15cc02f518e08f/91052621899.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e54c5e1d267d0c4ee8cc78b017c2b4ed/makemojamogedizeradaxow.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/10475506828.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/63387107211.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/73260130583.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/fekamonanilagotibalo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136938be6a7e---jumokojopijipimakedula.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/xosibuzaraxajolamubigal.pdfIn PDF document text
    • https://bak.vn/upload/files/73080166798.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/nujefewedifenefixuwew.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/tujugewokuzi.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/4441598903.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/bixen.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/bivufixaxu.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/litakulisefelovejujexu.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/tuzudufidilogibutir.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f85fa2a7cc---netukirovoxitotaga.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/biworiwozeworem.pdfIn PDF document text
    • 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_off0000b271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB271 10800 bytes
SHA-256: 19a7af8913bf89cba519182b82b35e7129db08984caaac85c9d9a4f7e2ed735a
font_01_sfnt_off0000cb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 18524 bytes
SHA-256: 4f24cdeb9f0e0dcb84cc132019267cff738187419c150399ccca4d0394c05e8b
font_02_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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