Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c376e9a44252ac…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 21:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7837bc9a4a3899d2cec355398c1e19fb SHA-1: 2b2b6e63283d7caf90eca8f47a8a444e791c1cc1 SHA-256: 43c376e9a44252aca6d20a0f67d6eea67f4ccb3da2a9a61bc3bb002ed56fd049
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including a ML classifier flagging it as malicious and ClamAV detection as Pdf.Phishing.Trojan. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into believing they need a password to access an archive, likely containing a malicious payload. The embedded URLs point to various PDF files hosted on potentially compromised or disposable domains, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=how+to+unlock+pattern+lock+on+android+without+losing+data
    • http://master-vin.ru/files/file/wizez.pdf
    • http://liveranigioielli.it/userfiles/files/pexopovetafakifajedusuxip.pdf
    • http://viettruss.com/upload/file/paviparaj.pdf
    • http://spostojow.pl/userfiles/file/losixawavizekus.pdf
    • http://ivankotov.ru/img/lib/file/jipinimulonajenedafa.pdf
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/45941391863.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d0bfa3ce858501ca11bd07a6a5898526/99749543882.pdf
    • http://konikanarrowfab.com/ckfinder/userfiles/files/lotowizorebike.pdf
    • http://honghuibio.com/d/files/xakukedorus.pdf
    • http://orenprom.com/img/account/file/luxajiremejujorosubatuwa.pdf
    • http://sasnowosielski.com/ckfinder/userfiles/files/ginerelomewusawotigozeseg.pdf
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/60765472732.pdf
    • http://chayka-svg.ru/files/wetonebagunapowos.pdf
    • https://cukimentescukraszda.hu/files/files/32865999705.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137446701c23---73896893457.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161306d2020cf7---36979298328.pdf
    • http://gattoneva.pl/pages/userfiles/file/93492617579.pdf
    • http://urbancollab.com/userfiles/Proj_Name/files/53995274121.pdf
    • http://nissanotogovap.net/uploads/images/files/tezuvitaw.pdf
    • https://tectrongim.com/uploads/file/31231674248.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/pedugefij.pdf
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/11258931843.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/e79e4b426e2cb6f87d4220ca6c5f2888/94554818027.pdf
    • https://rusepress.com/uploads/wysiwyg/files/sixoposojegudizub.pdf
    • http://doo-san.com/userfiles/file/20210910145302.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_off0000ddf4.bin
6860eff6867dfda365e5e4ea2c9df9c9de72aa904637b890f0ca141b5b6e39f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 18400 bytes
font_01_sfnt_off00010d2f.bin
78dd3567bd6b50b875ad98c16f3bef8b4aa6a02b8ccd8bbe691dd5a76c2725a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 11064 bytes
font_02_sfnt_off000126b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 16792 bytes

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