Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0a9a3ddb46c267…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 22:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10013aa6706f29ad6913efe72d3df134 SHA-1: 1435d0b690b63e6ff001635013506ddf2680a215 SHA-256: bd0a9a3ddb46c267fa604dcd42079b7b425742e300c0567a38080ada061d3db3
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, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised CMS uploads. The document body was unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8356ded98a74fbf72c0e85b3b11277ad/83724071559.pdf In PDF document text
    • http://hani-bee.com/userfiles/files/7666433850.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb9e6ef376---23454472826.pdfIn PDF document text
    • https://master-service.ro/images/file/gipuwozufajomifilof.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/61918475536.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/hu1r504poe0fui0di9kjpke8jh/bomizupabug.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/35dqgnjmm0g5a7ddfo30ur1087/41558054366.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/zofujem.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48663459253.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c8b5ccc4---76109251313.pdfIn PDF document text
    • http://btfa.tw/upload/files/37776935721.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4a6b0bc11---25830595416.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3f4e6dac2---72144188971.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/toragajejefurubawoga.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963c1057088---gopategivafuri.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/15616432843.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/paxerirujenogidasul.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/679238970.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4b726f09---30862749825.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/81066643288.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a23297e50c94ca96dc503e4de4eee41/titobuvedopukugaxopar.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/nu45rec1h1ferdhjo6irla8r81/guwibopado.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/85341985135.pdfIn PDF document text
    • https://majubesar.org/contents/files/bonixamekimapunogu.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/99770090246.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5e8a3e7010e0c9ad2028fd8891ced822/485012198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dasa+dharma+pramuka+dan+trisatya+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_off0000cfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD6 10772 bytes
SHA-256: ae9ad8de6414e4930dcaa693b539dc0384251a102e8101fde51400d461dcf3be
font_01_sfnt_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 19108 bytes
SHA-256: d5b8e22e05a79beb28a7a073903ea89c41f4a740a6f65ba6a6ea6acfcf54eefa
font_02_sfnt_off00011a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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