Malicious PDF — malware analysis report

Static analysis result for SHA-256 de003c2a6d7dfe5c…

MALICIOUS

PDF

71.1 KB Created: 2021-06-06 07:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07f5dceedcfc1b1e18259efe90e128fc SHA-1: fd942a59db8247120b251ed5c79e0e7618f2b746 SHA-256: de003c2a6d7dfe5c5a4d9f31531dddfdb4b48b7a267c95966c5eddc358977fb1
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a significant number of external URLs, many pointing to compromised WordPress sites. The document body, though heavily obfuscated, suggests a lure related to educational calendars, likely to trick users into downloading further malicious content. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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://crewmak.ru/uplcv?utm_term=kalender+pendidikan+2018+dan+2019+jawa+timur+pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089139c559d9---mibuzexibevoxipuluvu.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/riduwisupivaredoniwa.pdf
    • https://tecnibat.net/uploads/archivos/37630447628.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952a7f3c235---patojasijekoxoxikajokila.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/4f06787a6a8201949d02909dbff77163/xerixidunefisuwetoku.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757bb97fc4d---25869467599.pdf
    • http://tuanayapim.com/rsm/files/vukutumunefe.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607eabbe34de8---xabeniwarawivij.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/79f0abb4929f03c40ddc90a0bf5daa0b/gujufefujifife.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/rrgno3m3e6jpjd2j639mdc1q36/60068667597.pdf
    • http://bestbuyfromindia.com/userfiles/file/zupanal.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab12b964001---sipunuwe.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/bf0847a904ad81e4f7a0d889a5f3b2ee/kuxekidafetunulupowilolu.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e678645df0ba160942d52d6b3d7d2a50/98263749858.pdf
    • http://wojno-stal.pl/pliki/file/bafowaxotativiju.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/bb367335974017aab52b2ad0b5a12179/50678603980.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7d8cecc334e5385a4e4208815f7b6470/tonezafuzofozesejef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8a4.bin
48d52bc44505b2d655a8e898dc4892d4b9ee8df043ad27e7d178606fe9193eeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 5884 bytes
font_01_sfnt_off0000ecb5.bin
2fbe3e4072f79ab18262ddf6c69018763a823b9418f0f74b2064a4c7e4b9e8bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 10244 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.