Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53793f800e1d07d…

MALICIOUS

PDF

68.5 KB Created: 2021-10-03 02:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d63fa94bceed4ab12ad49df26f35f81 SHA-1: b906a6d1a9ef873152dc5881f3f5640860e509ef SHA-256: e53793f800e1d07d3cc046c90ca7627b417cf7f24bb01425e9ec7518fc825494
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm that directs users to multiple external websites, some hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16150141b28f2c---48958987355.pdf
    • https://zifu-tech.com/app/webroot/userfiles/files/fetowewefibuguto.pdf
    • http://hagelkonzept.de/userfiles/file/75412984013.pdf
    • http://sbsinternationalschool.org/userfiles/file/xegevosapanenosemaxoz.pdf
    • https://recapress.com/ckfinder/userfiles/files/84339578403.pdf
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/wofowofazadisobetuxexejo.pdf
    • https://pioneerlift.com/upfiles/editor/files/51604166048.pdf
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/27734583338.pdf
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/batiluveleworojezuletufon.pdf
    • https://sunkamalzemecilik.com/userfiles/file/tipedev.pdf
    • http://mastera-mix.ru/ckfinder/userfiles/files/20313517199.pdf
    • http://gemwishrs.com/ckfinder/stones/files/roziwulofifivitifubese.pdf
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/54716370974.pdf
    • http://haisushitogo.com/uploads/files/wazinagobujiwajaze.pdf
    • https://reklama71.ru/upload_picture/74526413324.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/e79261ad7a823a7913e3047305819436/fotav.pdf
    • http://epmachine.ru/d/files/toguvovelawajeguwigiwi.pdf
    • http://derkwoo.com/upload/editor/files/98451273895.pdf
    • https://ahha.az/userfiles/file/86041928988.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7v87frt38vf8amojt83u2ddv96/44374757600.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/88758394127.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b2c75fbfa---lalivazakeweguxizakij.pdf
    • http://letsfinal.com/userfiles/file/14153873864.pdf
    • http://samocvet.org/foto/ck/files/40040097535.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=opf3+lewis+structure
    • 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_off0000aedd.bin
ccb4c893f352086f23bef4bbafa0b31bb9b2a671b682ddbb04c30feefe859926
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDD 10468 bytes
font_01_sfnt_off0000c6f8.bin
d87aa1e605ced2d05688e125781cb61fa8d13d1badee347390043d1847e6cdfb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 15008 bytes
font_02_sfnt_off0000ecca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 16792 bytes