Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd826eeaa9a16318…

MALICIOUS

PDF

76.4 KB Created: 2021-09-03 23:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d78a6a4f344bee16f61e0d34f0c3830 SHA-1: 3c2b5d2cac33ae09c1e2fe81da800148648bab42 SHA-256: bd826eeaa9a16318a1bbe41c2fb2b4a8b8be72982838080522cab659b4e184c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of external URI heuristics and the compromised CMS upload link farm heuristic further support its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bright-mineral.com/uploadfile/file/2021052017233286.pdf In PDF document text
    • https://laplacedesstores.com/upload/file/sesotofi.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/9298237925.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/17122866449.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ac6aed7a26540366bc7c4bd096b9a80/nepamunexakafovozoxej.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb1bee50ed---90330324246.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/gewemidedajoninawifevusi.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/zonoronila.pdfIn PDF document text
    • https://mondialardesia.it/file/finezixowokomunuluxudoni.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/03654f5131fe574252f027596fcfbdbb/61753578638.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16085eea22d95b---ludujixof.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/4037575dce496cd0acd17b4352067452/mumowukagegaxa.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/jodudezovuwafimixim.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/75725498608.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c0315fce---salamebumabasisirarulen.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/o9plqohofr7mdccinevs4sq4fi/78326129686.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/84160487365.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b379fbe137a---gasefesitarutiketijaxinub.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073695f6b30c---36323947709.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe56eb63d5---43772611012.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6d4292fd8193c94eae2a5c991e62e873/47539655066.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/54011355389.pdfIn PDF document text
    • https://maria-galland.ru/files/file/20474817193.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8d941733642ff76ba5699f39855362ab/ritovigurefukekif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=biomedical+instrumentation+and+measurements+by+anandanatarajan+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_off0000c29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29F 11316 bytes
SHA-256: 894fda9f56c073b4d1cc1c30c8965e52fd0db85cfe89aa323d5ce79d355e8f57
font_01_sfnt_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 18160 bytes
SHA-256: 35c4a695ea6691117d0da69c1a60996e5cb26ca58961988b6a60ec39714f5796

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