Malicious PDF — malware analysis report

Static analysis result for SHA-256 4536253862d47eb9…

MALICIOUS

PDF

90.6 KB Created: 2021-08-25 20:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aca2d0c1131ef9da6c515dd9a7ee17fa SHA-1: 862bda85487208797835ea3e8a2566f8a1f4bbb2 SHA-256: 4536253862d47eb95f69d981cd4cec3859f8f699ab1aed5c89f7a48739cbe7ac
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=attribution+theory+classroom+activities PDF link annotation
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d18d9304d9---webotikiwa.pdfIn PDF document text
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/9062341839.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609bef5d552c2---perewevepatu.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/wezumadobiz.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707cde0b7b4---japogepajabu.pdfIn PDF document text
    • http://tms-operation.com/upload/files/15464977598.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/62505521848.pdfIn PDF document text
    • https://synersys.fr/contenu/file/75250870706.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/68860914435.pdfIn PDF document text
    • http://kelvista.lt/images/files/ruwuvekelak.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/72b9c162473b6d735436728905d0b56d/teretifipiwirawavuxinurex.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/18124254171.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7tr5b2nourjeuoud8tc6nou5sq/kusinisemelesokefenugu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/40869drkbqgfjacafogh06848o/tuzolujarizan.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/taluferovawuduleveneziki.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/59159259668.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad149b765b6---54074907882.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160881e74b0651---93558448633.pdfIn PDF document text
    • https://kenadong.com/contents/files/nekuvovetemigi.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/31836742330.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000109b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x109B8 18688 bytes
SHA-256: ecfb9baadd775b3227e1beadcae7407f1a87f806366e3f2426cbed0fd2d2da5f
font_00_sfnt_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 16864 bytes
SHA-256: 0e6c22f6d8bbd4b9deaff0c3d31f468b920a5c2e5cdecb305b35ca6c86f575d5
font_02_sfnt_off0001282c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14043 10896 bytes
SHA-256: c45194e75e4c1af8e918b359b8c0ff865c7af4597265644c8f70fa808af85563

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