Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb1de08a47763d5…

MALICIOUS

PDF

107.4 KB Created: 2021-09-05 15:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 760f074243817fc77d27e5fe7260a1ee SHA-1: 9141522cecba55affa1018ed049cd1e5f1f108d4 SHA-256: bcb1de08a47763d5e4909cd1a803b84125aa8d85750f5ac372a170d89fa5f218
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://samtle.net/ckupload/files/lomopigodukumafutoj.pdf In PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/02kudt3bo9id2ln1v9o3kck3a6/vatapusazidef.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/dunavimimegore.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab9a3caff4---52609246245.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210701_13281A15C79F48D5.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/xixolunap.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/4457488974.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/86828287588.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210616010338_99netc.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/mukesekojupomawe.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/mobarax.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/gasopeponolalewodabotadu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16129d866a8677---wumaxewebakuges.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0236bea62---75933975312.pdfIn PDF document text
    • https://craft-personal.de/userfiles/file/31964743601.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1b87d605---26202216476.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/116dafe5bd4483c028598af593671f46/40104531268.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/cd38c8052fe720c8c1170a8b0eb4ea6b/furafogigidarokef.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f3f3595cc---19977665580.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/36305300910.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607501b9c8b29---getolasagote.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/87734677844.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/72680616425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=golden+circle+iceland+map+pdfPDF 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_off00013d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15518 19716 bytes
SHA-256: dd3b16169e8cfb864a551f7ba7c5c0e1d5c65b5384037bdc2c430743379faefe
font_02_sfnt_off000187e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187E9 10552 bytes
SHA-256: 81026f5eeb112a5d6361e9b4c93477339d2b85dda45201784e39e0d6a4ea7b5a

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