Malicious PDF — malware analysis report

Static analysis result for SHA-256 b713bdd340d7d578…

MALICIOUS

PDF

90.1 KB Created: 2021-06-27 12:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0d5e9a051f65a3dc0b22a0151fce7d46 SHA-1: f8570a5a9f058d44a20c3a31102563c8ba174d47 SHA-256: b713bdd340d7d5789c4db56e4d3e63aeeac657a0764aef7a9b84531efaf65e87
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, hosting numerous PDFs on compromised WordPress sites, likely to distribute further malicious content or phish users. The presence of multiple distinct hosts and links suggests a coordinated effort to spread malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/f4nts2tbipdv6g3do7tu705fo4/93172268503.pdf In PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/eg87158vjk3mkstr3h06me59r0/31407945164.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/4iq6k0mf4gbouic8pu4k6ka1dr/2544288880.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/gurarotulepegugevisoka.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36d957a7e---nimobuwagalomi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/12090c8e8c938aa13556d96a4c6b85d4/mavip.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/9c1dff49fa6c4b49b9cf35a22b489c4c/53645870461.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1124d068d0---lazivupelos.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2f3e2eccd1ee616f0a15c7cb94bfd45d/66475040134.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/2708f446474c636f71ce1c254538e545/78778547238.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/66515244614.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c481367062---vosodogagitijirapu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/46011d03906d3b12b8c6bf11d74d34e0/230744124.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/5359170540.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/35206685524.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kpk732p4347fnp1a3eminf2on4/3390008434.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a093a3d1f46---65333072628.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/78745082074.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609de5e1aa739---57610001778.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e238f6a260---jojofexevanoki.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160801bb82f733---73202130427.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/324f2322ec1f910a1a9ba6872d3ea76b/dilotevaberurujozomi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fa3f9eee5---ximakexigilejujedi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c050b652b---fabokodafepaduv.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/polikigipebulirokavuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=carol+thatcher+and+marco+grassPDF 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_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 10756 bytes
SHA-256: fb9098f52b828afd6926c4d67da449a0ba2b7ee48bcf5d11baf4bcfd1f32f392
font_01_sfnt_off000115d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D4 17468 bytes
SHA-256: 80e5c43cb583a9894536bc0ae0dd195952473dbb237b1853a2ad46b70bbec1c4
font_02_sfnt_off00014310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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