Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6663beb4c69416…

MALICIOUS

PDF

95.1 KB Created: 2021-07-21 02:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 09d421f71201d63a7ded6ebb7d44f0d4 SHA-1: bb54ba48e7043884047eed20d770e7274edc6510 SHA-256: ec6663beb4c6941626c916a9ca37ab62a1616e391fd95c16c807ae65e3361a00
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as a lure to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rsgpmmml9hodn1iirbnm1i95s7/piwuxifapotitowogulasisa.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/de975886d3b64c1d67bc18a75fd4f333/44955782913.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/0d191224b6631bb052d6823036be643c/fojubaxibalomawobejawak.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/93925870384.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210716151554.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/rifaburiduzimavom.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f63d11c99b8240d8a947b7eff92b70b/pijokunagatelabaputowilu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db16fd65879---14610110510.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/9b1270d027bb345aef3703332d9b69fd/89367924587.pdfIn PDF document text
    • http://htwy.com/upload/file/sazofuwerovi.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9f9e0ee81---pisil.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/pupiw.pdfIn PDF document text
    • http://hotstamping.pl/files/file/90756645886.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/09ae0353bb8f9085575eccf30d002185/fedejar.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/kaas3jlpl3km2neh3dj6lcta4v/gejaxabufedutaxudoxujawej.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/4749382860.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/goxokejutiz.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/38558435014.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/raselugaxegex.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/vigirujuwedatoseb.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160adea2eb0c64---23877022870.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/76129365142.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6ed17767c---rusirisojekanuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+meaning+of+commitmentPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 10432 bytes
SHA-256: 34189f1e3a35e537b46e4eebc95293f51659c22ebc5f440cc36012237bee625c
font_01_sfnt_off00011096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 18596 bytes
SHA-256: 9798ec4b94760d9c09bf6bc0fb9716fe9d1f65f080822a54cf5510ce10cc4e82
font_02_sfnt_off0001417c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001598d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1598D 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825