Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8ec7cc36914482…

MALICIOUS

PDF

68.8 KB Created: 2021-10-09 06:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1df59e9a1d82806245269a84b02eff5e SHA-1: e2853f82d7c5e041848440a8287b5d8e2c158a02 SHA-256: 1c8ec7cc369144825cfb0c12b9c3bf22f465ab1f8863619b6b1c879589ec51b1
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image designed to trick the user into interacting with a link, which directs to various external URLs, some impersonating brands like Chase. The presence of numerous links on compromised CMS uploads and disposable hosting suggests a campaign to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only PDF lure links to a brand-impersonating host high PDF_IMAGE_LURE_BRAND_HOST_LINK
    PDF is image-heavy with little real text and its clickable action targets a host carrying the brand name 'chase' as a domain label / subdomain segment on a registered domain that is not that brand's own and is not known-good (e.g. 'udai.walmartnewjersey.com', 'paypal-secure.net'). Unlike the homoglyph-typosquat rule, the brand here is spelled correctly but glued onto an unrelated domain — the canonical brand-impersonation phishing / scam carrier shape behind a screenshot-like lure page.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://medvor.ru/uplcv?utm_term=alabama+moon+book+online+free PDF link annotation
    • http://ingegnasrl.com/userfiles/files/xiroburel.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/75333445834.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/wuxuwapovatarimen.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/xanoparixalarimo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/231a7f31f1c42c58f220ed5fc66cbe56/toxilonez.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/71637521693.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/jimigenogikegipa.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/ranofunot.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/61686729848.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152309d81da8---94835534121.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b039251b5d---52487136313.pdfIn PDF document text
    • http://umhouses.com/uploads/files/wadiranolinokibivaxug.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/29315295499.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/lowivinelowimidivom.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7f826ed3b---68237307435.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/juzidenumugipekevajaluva.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16155dd41b81c5---napuzavugiperuwug.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/nadijekidimenot.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/xiruvinujezuzupigeg.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/waviveku.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/79979837705.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/85000869556.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109220432315612.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16149c0481b67c---4105529013.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/muxusubajap.pdfIn PDF document text
    • 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_off0000b334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB334 13740 bytes
SHA-256: 62a55d916ae05c9b5990e044a21b736f00cf2048625d10faf62b38571a54cbaf
font_01_sfnt_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 10324 bytes
SHA-256: 46d9927a73ae3a369b5a2dc03a83e362fce0d88098fbfe1f9893487a863095ef
font_02_sfnt_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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