Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac1b1a1bc099556…

MALICIOUS

PDF

87.5 KB Created: 2021-08-13 14:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86059333878e6fe69c6491922c311691 SHA-1: ea76ee22aa134f7ac6d81ce8b831c1560b1537f9 SHA-256: 9ac1b1a1bc099556b93d37f61297b94448929bd4ed8b8736a4fcc258b66a71ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics also indicate that the PDF acts as a link farm, pointing to multiple compromised websites and disposable hosting. These links likely serve as redirects to phishing or malware download sites, as suggested by the ClamAV detection and ML classifier flagging it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://hoanggiaphatland.com/uploads/image/files/10383935442.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/m71s2d52vre164r0jgjdc0kjd6/zozufogorevodorodi.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ejeikv8udmbk24lgg7274v0eoj/zofijekoxabosafixa.pdf
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/wezabevuri.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d034f2dbdb0---zasizexuxiniburovelelitan.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a50ac52786---11238434359.pdf
    • http://lnianemarzenie.pl/userfiles/file/gusoxizinagis.pdf
    • https://easypayindia.in/userfiles/file/96714314722.pdf
    • http://orhs76reunion.com/clients/30721/File/lelodenok.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41d38e41ce---puwodolizovigexikikuk.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kegevexuvoxitodo.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf8900601---pininelokuliladewitoka.pdf
    • http://zcapitalcrm.com/app/webroot/uploads/files/gutujemototonemonivul.pdf
    • http://vhshf.de/File/jozuxosowidiwidorobuxos.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829169cf56d---64164128460.pdf
    • http://allaboutdowney.com/userimages/mopafelemezamuvakiteso.pdf
    • http://goldenpeak.it/userfiles/files/7166284121.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc638bc8d9---49991814543.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/mcb9u1ia3se6lcl971ckvvslc6/zafakafibuvekalemanete.pdf
    • http://greenbrier101.com/userimages/kawikoxulibopigu.pdf
    • https://jamisonfurnace.ca/userfiles/files/rusesedutokaguwavegipek.pdf
    • http://sincaremedicaltour.com/js/upload/jesujarubusimiwaxemux.pdf
    • http://charivne.info/images/file/45331825432.pdf
    • http://mariamozharova.ru/uploads/files/42806567477.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=soal+olimpiade+biologi+sma+2018+dan+pembahasannya+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f114.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 16792 bytes
font_01_sfnt_off0001092b.bin
6f5b8978afebaf246d040b25946b460759627f30013f08553bf8623daad6cdc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 11580 bytes
font_02_sfnt_off00012401.bin
7d604a60b761fc67474b8696c2fd0aa3f22511b6a74b7e7989348e25944de758
pdf-font-stream PDF embedded font (sfnt) at offset 0x12401 16496 bytes