Malicious PDF — malware analysis report

Static analysis result for SHA-256 1769fc0b8e388792…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 11:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee27d4240e050933582619592fc08fe9 SHA-1: 054e456503203566c979a912a4caf76568ab9b65 SHA-256: 1769fc0b8e388792026381bdd268c4bad9c36751acd7070ebd584ce895f50968
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm or download lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading files. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=hill+climb+racing+1+hack+download
    • http://onroerendgoedindex.nl/images/uploads/kifikix.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/10696723791.pdf
    • http://arndt-fahrschule.de/userfiles/file/wetufimobonulesaxaf.pdf
    • http://miwon.com.vn/app/webroot/uploads/files/68581163383.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde9be54c3---94900464960.pdf
    • http://t-eamplus.de/web/editor/files/lapatakosibam.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/0t322lq2s39l0a9h65a2pljj6r/vejoxupozuxede.pdf
    • https://jyapa.com/jhuoyue/uploadfiles/54436632127.pdf
    • http://oris-am.com/editor_up/simuxuzizimixewazap.pdf
    • https://dichvuhappyhouse.com/upload/files/53398084686.pdf
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/sipabinaterovan.pdf
    • https://asiarsolutions.com/userfiles/file/43871538363.pdf
    • https://lazeo.nl/userfiles/file/80633553830.pdf
    • http://diagcorlifescience.com/attachment/file/folazumo.pdf
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/nupaxorasujovaf.pdf
    • https://saikekanglun.com/filespath/files/20210915181057.pdf
    • http://punaide.com/userfiles/files/bekuxozebakifufu.pdf
    • http://cheapmarkt.com/userfiles/file/72407885638.pdf
    • https://cambodiadriverservice.com/userfiles/file/96741070046.pdf
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/nefalezebupefefupapemed.pdf
    • http://atomicattack.com/atomic/fckimages/file/gipegunixapege.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161387f51ab161---nefosaxiruposalopig.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a085a0735899856666ccfadb65742017/25434607457.pdf
    • http://sys-svinding.dk/userfiles/file/zonagot.pdf
    • http://hk-sai.com/ckfinder/userfiles/files/sivubirobofujiluvipoton.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/94689803981.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_off0000d7c2.bin
0bd28863cb34339ae65f7ba5e28282428e4d23a13ee6877d3fb172a3d9cceb8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 17512 bytes
font_01_sfnt_off000104f4.bin
c4749ee0072dcd7aaccb50e28f9037382838f1f056369ad5b365c0ac43f9f320
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 10780 bytes
font_02_sfnt_off00011d56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 16792 bytes