Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b27c515b5f593d6…

MALICIOUS

PDF

71.8 KB Created: 2021-08-30 21:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2264c792db5df2a4c5df154951b9fb77 SHA-1: 3d8cbce0de98ffe24d98f7dcf42b4bb6750365f0 SHA-256: 6b27c515b5f593d6fe56c476c39846a47ac499694cc9b356118a9547ce419828
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to suspicious domains, supports the conclusion that the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://ahcxdq.com/uploads/file/112348378287.pdf In PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/40545525968.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/vitulomevedazerejiweber.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/zawapafazedu.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/52576487941.pdfIn PDF document text
    • http://tcihk.com/userfiles/77887831383.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/divifutisuruwu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d559c0970cc---mopezigib.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/mufidimoduji.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073bad991017---nurijit.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/pexarevefenalifos.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/58177252522.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/xixuweke.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ll5pvvcf6djq06sl1efnq7h62b/2943935843.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/mijafukodanu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16102fc06608f8---zakujuperigobiwewomap.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/eed8a26ff8fc1f7d1a45b386f7517ce6/42324058218.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b879910d54---55679654379.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/vimitegamubev.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/wizixipefibiwugijas.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/10491156169.pdfIn PDF document text
    • http://poorclarescork.ie/images/ninudebemeginitidesuwe.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a6836314d5a---sadupedaxapobonugitavajo.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/68roa9h1prmt6mei4srq1p34dc/sovomemonubuzadojafon.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd19da7384768c607ee01b2ed6ab58b5/90915410512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=braille+to+englishPDF link annotation
    • 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_off0000bcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEC 14684 bytes
SHA-256: a119012655461eeb232b4b796586ac2d47aa5404d122a1581a68b07039d692ca
font_01_sfnt_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 10440 bytes
SHA-256: 890fa282715bb2f5a5944f93190c27b05e11fa7a4e03eed9afff9ee7c8f2c776
font_02_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1