Malicious PDF — malware analysis report

Static analysis result for SHA-256 6691fa321e5cb003…

MALICIOUS

PDF

82.5 KB Created: 2021-07-22 23:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 403a47a349bc243b72d1bb12458fe677 SHA-1: 27e120460354f5a4d182c3ac17891272cf4249a9 SHA-256: 6691fa321e5cb0034eede0313b54c23b10bffd265712f802328d7bcbf743304d
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3cf254ece670cedb311075ecac575923/45072433154.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/76364467068.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/vokepifedomukaxexoxe.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f6d97afbb---36293566011.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ff0053de---viduf.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/zugotevolukigemafid.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609423f969595---kepoxawuzotagamibofima.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/muzukesinori.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166a397103---futawuwi.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/49615965563.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/susid.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/titugujiruzizijubedunir.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f712df958---tosevewotituk.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7cb45c1d13ba9e65a004977cece5bedc/27889455870.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b338a3e7274---zasizuniwijogowixesawula.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/iqcrr5334vfe3dji6ii803bm64/7493064892.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/raniwibegafewaworakipumu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/601e53bd3a4d2c285378f7485e72c4ab/zumetunu.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/nikekegatuzilobapi.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/33747160bc08b36565eec84a1adce358/99631523121.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/24653843748.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4443b01b15ec6dfb50ea7dba593b2465/35748113989.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/89400454420.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7254824298f43b6f08ef0c5a682dccc7/nurixurosidad.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/tibivak.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ac9tp3dgck9779smkhvqcr1u73/miniwovepejopag.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9eb69e022---47754837055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=electroneum+to+usd+converterPDF 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_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 17340 bytes
SHA-256: 98f7ec14f50cb2785f6090145e82b92601706a09588b7e7102d8c0e8d66e88f4
font_01_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 10424 bytes
SHA-256: 4fc5eb3e3f24f1d9bde922ae28f914166ec4b5d48d0e216c09187cf8b19bb911
font_02_sfnt_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1