Malicious PDF — malware analysis report

Static analysis result for SHA-256 917d6ae5d549715d…

MALICIOUS

PDF

91.7 KB Created: 2021-08-26 09:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9eb45efc13e63fa8f92aaf8d409e992b SHA-1: ac0a3f77374b9378c59ba5d8dedcdc8204141ce8 SHA-256: 917d6ae5d549715d2b78e1ae82842d2913bd2927a1ffaf776f8a3ff068e40f85
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 is likely a phishing or trojan delivery mechanism. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or further stages of an attack. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://huntic.ru/uplcv?utm_term=find+the+area+of+the+shape+below PDF link annotation
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/pozuj.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/jarijofokoxak.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/aildqg4reevodib6c0hm6cpjc3/76153094473.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ed9cd2a527175907ca577a05071bfe90/9564277590.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d069bdcc2ef---gavowelafexaj.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc9d540424---35524446915.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/bavebepok.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/gitokutisokewezuvo.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210710180606_fdk61u.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac6569f07---dogajo.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210705193740_139150766.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/guxakiva.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/29668541268.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/getujozak.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8edf756b46---garexot.pdfIn PDF document text
    • http://recrute.fr/files/files/7985826207.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/gatibizokobovog.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4a9c4c01ec3db824bb9116de8dcea7f7/81759301965.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/34303401935.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/46253921655.pdfIn PDF document text
    • http://epplast.com/files/file/nijajenum.pdfIn PDF document text
    • http://mopron.ru/upload/files/69127183335.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2048ede0f1---66874667492.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c8e5e5aa5e---nupubusigofunevolatazaxo.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e11d13640fd---15566676202.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_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 10800 bytes
SHA-256: 49d6507b5092f13374450a882178f0602c055e4cffa06b0a5d97b868dde426a6
font_01_sfnt_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C8 16772 bytes
SHA-256: 21594871f8c8aa2b3fb7333f15f90e73475c78956d09998677fc188aee594260

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