Malicious PDF — malware analysis report

Static analysis result for SHA-256 21099d56f5c9edd0…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 16:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 721d4176e98e0fdd10aa6131539252a9 SHA-1: ad50ebc4de1bde97ffde3b1ae028fd4e4020351b SHA-256: 21099d56f5c9edd0fe107df76addce526fca66c2f635f68cb1b1c01c1115947a
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous links and the ML/ClamAV detections strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://luminex.pl/upload/file/2792045992.pdf In PDF document text
    • https://svltv.in/userfiles/files/kovelufalujovezibesuzisev.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/laresawexitilonedutot.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/75639728723.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/86965112980.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/71568581714.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/zogonubeme.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/77314557980.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/88111724911.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/23280436468.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/wonodusivipegagud.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/13d80cc6f67271b62c6c3f287c4413b9/zotiwix.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0e61be4a877cda55c9d6f887979c8ef1/kijokagixagujir.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf95ec743---totikedegipux.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89d13abc0---tumiv.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613616690ea42---50525439799.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/bvg7p5omljiu3rhe7cpd417oe1/mamokezeworaw.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/nimeges.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/81663186001.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/tisuz.pdfIn PDF document text
    • http://bibikid.ru/upload/vojowukutonelabovevibofag.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/99844706235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=shadow+fight+2+mod+apk+special+edition+max+levelPDF 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_off0000cd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD85 11508 bytes
SHA-256: 379e3241509a10ad3c4653447ff8bebf338d98cab60b089d5860c0f659e347c4
font_01_sfnt_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 19628 bytes
SHA-256: 7880302082e899f98ebd48de2ec13e31521849c16b64c32eb9cc4c3797bede6c
font_02_sfnt_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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