Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82f7ab701b301da…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 17:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 716143a1f801ea5491e7b2073db3aa76 SHA-1: a84f91b3972be0d192bb340f4bd9069e5919b1d4 SHA-256: c82f7ab701b301da8c637f51166168eb4438116689046468fe03739850042513
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. Numerous URLs are present, many pointing to compromised CMS uploads or disposable hosting, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=turtle+diary+prepositions+worksheets PDF link annotation
    • http://eventclub.pl/userfiles/file/26781991279.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/rolesedukejefomela.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/585996ed10d252bed900900106f0d409/talakoxowajipovaxefidek.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/bugilonixinur.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/puwimesekowanan.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/gavixigokajologiloxa.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/kigavogitudodakuj.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a5d03bea5---zekinamoxixojigogusop.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/77470143743.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/50079682584.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ea1df64d17740783970eeba6bf8d7fe5/fibuzipiruxebiroka.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec49825f46---rusopetemimib.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/42141934594.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f9a916118---sekonelinuzamuroloma.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/koninabawesusajivegasi.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609db871c70b0---61823970822.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/72495694640.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/3724288225.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/61979893563.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f643210a18---43827629164.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/xexivegob.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/xakadatupuraduluvegapi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612478a708880---wewusiboxipiwo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/ladajinanupedojufato.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16132e42b27eeb---12900499350.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_off0000cc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC65 10844 bytes
SHA-256: 78d2906ba0377cca3e4c259816ad0bc39780764cdcb181869be67aa8a6b834e2
font_01_sfnt_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 19124 bytes
SHA-256: e2feae549f2cb8d034ce5d520c427790e66056364c748410513ccda28e28bcce

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