Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e8bf0400df086a…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 11:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5990c70241426a00772b0946ba38141 SHA-1: f3f5d8bee8515bd9a8e38a77b1e0cdebcb496485 SHA-256: 63e8bf0400df086a03956908aed85c29b61ce8ea04ec37a36b3784bc6a3c839d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary attack pattern involves luring users to potentially malicious content via these links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/f71502505c24a5443d04e21fbd5b9bed/31941342456.pdf In PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/46778524993.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868a2854639---53325388642.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2cc75dede---wasam.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646253459d---xedejojokew.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160d47e5a22ef7---72950197748.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3a820961---josonejimabikup.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/30278497347.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/monujejinunagusekuruvoze.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/14364183445.pdfIn PDF document text
    • http://topas.lt/userfiles/file/92057594116.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/69868241996.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/kl6s018b364bt9970cki884em5/77978837152.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16075274e468e4---1590587880.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3fca211a---gonenilivuluwutesudune.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-28/20210728031945216308.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/fimizateluzevuj.pdfIn PDF document text
    • http://come2menorca.com/images/file/xefegelinowogulikizopub.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bfd502d65---68454359086.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/25249986417.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/913d343121c11848764a30ba421512d4/linexotujebupujilisomav.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/jegijaranuxako.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/xelasixelako.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8493f811221b7075659215d74119ac98/tekiribugugebaw.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/936184a5cd7480c4bf67c8edfba6dd6d/seranuleni.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/94274825143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=vertical+and+horizontal+lines+worksheetsPDF 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_off0000c387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC387 16820 bytes
SHA-256: 874f25a803109b3a4c1412ddbaa3ca954fe7d277f20a137576e721887b9a1f0a
font_01_sfnt_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 10676 bytes
SHA-256: 7e50167ef6926aa79ad85193f80e3f9c07e738370b73e4d98b07affe73b6a8e0
font_02_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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