Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8b413d63cbd004…

MALICIOUS

PDF

71.2 KB Created: 2021-08-29 01:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 1038b02204b08285a73f71451ea04746 SHA-1: 6e63b215541d1e9745e3583fa13bd95f5da8cb9b SHA-256: db8b413d63cbd004cece2032da2ae837fe6d1693a42048bae5c82a2db7e2b411
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics and URL analysis strongly indicate a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/hc7t1919ubq22ot0a0ekqv3df6/88993593757.pdf In PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pezinimibi.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/fajenijo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c16daa093---30328775201.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/79716055793.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/c0abe69791cc59b740c29e911782bd48/damolareza.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/wuxutuwifefufoli.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ohasbmk1ijeotj86mq7kmlo274/51298126483.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/85bf624f651aa0fff2633fea2c38df0b/57625870264.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/72016863503.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105040614332825.pdfIn PDF document text
    • http://sswjeans.com/files/8585078211.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210828080714.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c67737c84ec---50101021655.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210521141840495787wiglrl.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/kenidetivonubomuguper.pdfIn PDF document text
    • https://coil.hk/upload/files/rakawokulawudotu.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/cubqret4lcolv0ds2u98454u8u/zemomunetidipepazo.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127d3b4d064e---rezalumigugawi.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/d404e00d2133e27b359ee13c6fee35fc/65533497721.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/bibupuxed.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/82791928800.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/zonepivusi.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/26430479874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=where+does+the+second+stage+of+photosynthesis+occurPDF 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_off0000b647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5E 11060 bytes
SHA-256: 80899e8fb419c84d9a036db9e93a00a0b719b15fe943290561ab4f5f3f2f4969
font_02_sfnt_off0000e7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EB 15512 bytes
SHA-256: a834d8f3bf12d4e09f73703c49f085b342d0467aabbb73988932e3a3a8173152

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