Malicious PDF — malware analysis report

Static analysis result for SHA-256 85654a17397f445a…

MALICIOUS

PDF

76.1 KB Created: 2021-08-11 16:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99435b568ae21b35ea227f6a11a568d6 SHA-1: fe52c50a5d94b41d3fbb717d10f06b26f5ae5ab3 SHA-256: 85654a17397f445a77e00fcde0c5d70e13f68aacd593038dc0f223d7491aecec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting domains. The presence of these links suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://alnahamgroup.com/userfiles/file/17458363397.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/brvssf07lej707t7hf0nn7unum/35881762596.pdf
    • https://scriptdd.com/_file/file/49011783046.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/86343159712.pdf
    • https://www.bnbtravels.com/ckfinder/userfiles/files/90554548304.pdf
    • https://quatcongnghieput.com/uploads/files/vumelemuburedipevivele.pdf
    • https://dienlanhhonganh.com/images/pic/file/xitolinulebovupe.pdf
    • http://diversecityuk.com/userfiles/file/vapewuxipuwusaweroxa.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/bemopolatodobujeluvujo.pdf
    • http://cheers-gifts.com/userfiles/jizoxatutifi.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca283abf9e---direfediwagidavup.pdf
    • https://patc.fr/imagesfile/15075576799.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c13b3564a4c---vevopuk.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcd9fc07e3---wazogozadilosufatofel.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988e87283fe---16496102233.pdf
    • http://avandcie-energy.fr/ckfinder/userfiles/files/darakixijis.pdf
    • http://jkmdc.com/aversystem.com/userfiles/file/30002356752.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bbc0e4628e749035fcf853a278ea598a/zivokutosesizas.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a57627cb21b---rafijapukopopeg.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cda56a4b8---59980864268.pdf
    • http://littlepearlspublishing.in/data/eimages/file/35257751222.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=evaluation+sur+le+triangle+rectangle+ce2
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c339.bin
861c505f193197bd01c37ecede6b0ef8970a9e17e5e6c7a10da37f81d002dcb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC339 10672 bytes
font_01_sfnt_off0000dbe7.bin
80c1718eb93991700b47cee9393d5c7fd8b22eeb303372e22a437327f7db324b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 17268 bytes
font_02_sfnt_off00010808.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 16792 bytes