Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b064d1c078a6f78…

MALICIOUS

PDF

89.3 KB Created: 2021-07-26 07:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1d1b46de29c0d55596f6999f2e37fbb SHA-1: 56663b480696f6717c4365c39e9754d154ce2ad2 SHA-256: 6b064d1c078a6f7897b0bd25d8ef9ff4c47d827b3860c2bacde9957d663d400d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links, likely to obscure the true destination or to spread malicious content. ClamAV detection and ML classification strongly suggest malicious intent, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://jagatjyotischool.org/jagatjyotischool/userfiles/file/pebevufukotadetebafo.pdf In PDF document text
    • http://europavloeren.nl/siteimages/file/xenufosizirubumomarixel.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/hjffperhvjrhdl5208r6c1h6ld/35559922011.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160822ef624434---fixofudirek.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/56c48c2fe5154547f5dadcc2bffffa90/sonorogofirakexurosat.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/varabuwiwewegu.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/r9n5g1la028mh7eji1romlcbvv/wepozalotumutukagomax.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c889165986---dejemoxomadok.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3720d773f84afcb5e488de77a941ca79/94509826313.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160753855258d9---zaxozimoz.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/jerojizuvalixagufesiliv.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/38c58c3905f3be6bf500a74c8b5f8566/5862673607.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b974a5531c9---sirofudunumoledeludufaxu.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/hh3r4n1toe5tds3dc0aumpgg3i/29058362718.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/lilefewe.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/97296351044.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce28339fecd32fc72bc6fdf63c715f46/86413521046.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079659674460---gurer.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd76af4749b---46075624646.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210726052152.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/tozobipibesuvo.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/69692835603.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/56920150302.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/sixazesiwa.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/72233454346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=enfermedad+que+causa+moretones+en+el+cuerpoPDF 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_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 17972 bytes
SHA-256: 7afe6d830f2750a662eaa9cb1d428f315983cd37293209f339a2d9167fde6cd3
font_01_sfnt_off00012579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D90 10920 bytes
SHA-256: 2cd2dae151d9f357b2b51b4dd3f7751ea677b52cd375963dd55cc492068ceea6