Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c5bd038c5733fc…

MALICIOUS

PDF

76.8 KB Created: 2021-09-10 19:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 793ecfc6cc62a49cdc4cdf84ca72ef87 SHA-1: 138fbba63f88a3c1637682651a0626b9cb3d1f35 SHA-256: f0c5bd038c5733fc836d19662303c0cf7834abd9fb7dcb12122bc020765182ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=guitar+hero+5+apk PDF link annotation
    • http://casaatlantida.com/userfiles/file///vevajanegonogejonu.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/bapowinajun.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/xasoritefoxujevape.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/58968235561.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/kiluvigepogojuko.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/lumagifelijetajatuwanubev.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/lakerediderameter.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/36874703851.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/tixokekawili.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/62555618653.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/xerow.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/40367168424.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/nakazetaxazorezulofebi.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16138e09bbff4c---bodapadefedirigoto.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/tikib.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/1129265716.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d532b5f6d---70627188860.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/suvolizurasojudaderemina.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/23699432926.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f3dbdbe6d---20242521783.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84424cf31---65199492012.pdfIn PDF document text
    • https://servicepapik.ro/files/50657253216.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/13634788628.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/2254549156.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/tufelero.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_off0000c55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55C 18996 bytes
SHA-256: d40d67796e6547110ac8b1435d830bbcb367b9602466b9e981f1aed41be57079
font_01_sfnt_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 10396 bytes
SHA-256: e1ca1b9f3f4a92c3ac7b042c967fb4279cadea4e46455c57809c77fa8bf90055
font_02_sfnt_off00010d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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