Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6322f11a7c3de1b…

MALICIOUS

PDF

96.7 KB Created: 2021-09-06 01:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 58a3b0f7c0e86a6b11487b834766bc53 SHA-1: adf0dd1fb030c2c6e060e2d8cdebbec64bf89a1f SHA-256: b6322f11a7c3de1b7c255987483ac9be2359a749b85aa669e2deec34f3f0e9bc
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or track user engagement with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://ngor2-3.com/file_media/file_image/file/sigujunidub.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74b405322---logagaxulisam.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca64d8f82e---38276553960.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81497ca46---79085174870.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a6fd6c979---42431624483.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/39581414217.pdfIn PDF document text
    • http://status.cz/UserFiles/File/rokerukopozigefemotovube.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/baxot.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/91315200704.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/musovunafudug.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ddfc66abfd4a46c86934838cb56b08e9/5711502050.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102cabe193eb---69188764938.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/86783755549.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1116bd3d4c---venoj.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/gamofuzelegozadalubivebo.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/wolanagexagenikakanobela.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8fee69746---mekinaviponelajukisewol.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/xiretedu.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/52695903621.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/wiwezemu.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/liwinebevozebabuxeful.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/suniledalofa.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/5efcd808910650910841df8d3cc00e06/lizemesobelemaroriloxivig.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0f74afddda4138919385fcd148f8a790/77152924675.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fd6827bdb76066e3ee78d48ff4ee1f82/20770019625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ancient+egyptian+social+pyramid+worksheetPDF 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_off00011514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11514 11232 bytes
SHA-256: ce1daa7ce0a91f3430a90266565b0e15f97f578f330b3daa1292d057f6c580e2
font_01_sfnt_off00012f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1E 17736 bytes
SHA-256: b054966dc9e666263e4aba914424eda5b878674a22fa9a5068c4eea0d9126c67
font_02_sfnt_off00015d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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