Malicious PDF — malware analysis report

Static analysis result for SHA-256 692c4473cd139fa3…

MALICIOUS

PDF

88.2 KB Created: 2021-09-04 21:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e79c1e6508fa34d68ce95a6cdb88ea70 SHA-1: e2183151644876bfaf7b2bc37e5251536b89dcb5 SHA-256: 692c4473cd139fa341029f3d1543f0803ddaab0e64654be6289a50584df72bf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=us+constitution+text+and+amendments+.pdf PDF link annotation
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161257a5ba02b4---femujozosi.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/9281848132.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/87794977246.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34d0155ac0---vefoteb.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/46411569d4c71facc2999c2835ec3005/63025494959.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6a9fc81e26448e94b08ffad68266ea6f/86979070597.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16120c61e54c6e---89546088821.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/juxokaxosina.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/26834660706.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/97d907821b2714e6f1d64f92879a1cc7/90929920348.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/vorudakuta.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/p9apqhi2980hi8pumcvd6mgji4/87070900389.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/lk1e7rl35vuu5sakkf3jhjku53/36890542208.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d087791eb8e---72625505104.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/konisatikasamagojovip.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/88216543368.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16103635db6b64---nonubadetufekabaz.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611261158e48e---62132002529.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5fead4f60bde6b94c57a9c1c14fc4b7/najafikezib.pdfIn PDF document text
    • https://xn--8--clcp3bi.xn--p1ai/files/vokutimewa.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/kejafoxigelito.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/dekima.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e591619262757c68e151ec8d5432f5bd/21142584373.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/31207741915.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/gudulu.pdfIn PDF document text
    • 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_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 18388 bytes
SHA-256: 4048c02aec753f26d7fa7af2bc6ead6bc62532c92e4592e333925f5e360a333a
font_01_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001397e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397E 10912 bytes
SHA-256: 43a078555a7db0774bd5328ff3612bb811a719f10089c194fe8f1c9ab8e87b9f

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