Malicious PDF — malware analysis report

Static analysis result for SHA-256 0939632b8d8105cf…

MALICIOUS

PDF

76.2 KB Created: 2021-06-30 05:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a4e2680cc4bba8d294eea14ad77917e SHA-1: 2d0e0735f09cfb93ebb05b38fa7802d792ee25d2 SHA-256: 0939632b8d8105cf2ca1d79495ae62d7c8018acdca6966005a90d1b9483417f3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, likely intended to host malicious content or redirect users to phishing sites. The presence of numerous unknown URLs suggests a broad attempt to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a4d6db8c0---tuzisobogunajenu.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab996cc1d8b---57957742870.pdf
    • http://travelshops.pl/userfiles/file/42913034710.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/218393c40f1780c94df2dafff7a970b0/79914962409.pdf
    • http://www.addvanceo.info/userfiles/files/wogudal.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/e17i2k7b00o3cmknulbofdqiss/pubirezutewekubuwo.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd51967f7ab---96512330962.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073097c04afa---guziwavuvajo.pdf
    • http://iehyun.com/editorupload/file/zikenok.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd16e1f78---temokuwuge.pdf
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021060307571980554.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb26f73ee8f---95770980671.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5172d3155da3cbff8d5c8573edb3959e/26433782559.pdf
    • http://acpiindia.com/userfiles/file/xunusonu.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7664e9282---fafurovajugejowifovo.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/faf9f3a805146bf3618681b8dfcda803/64081046435.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ee3b40e18fdfc0b2220424369e819c7a/49385981580.pdf
    • http://bocghedanang.com/media/ftp/file/37719524866.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11edfe5e04---29547155121.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2dcec887---lenogobaluximu.pdf
    • http://innotack.com/userfiles/files/48570645460.pdf
    • https://laser123.com/geektic/files/witilabudolumuju.pdf
    • http://galsabino.it/userfiles/files/puzasaranunesedajajopini.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/efdc16b1105e4aff1826f7a0224a3003/dideburuxudavikika.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073f907933ac---setad.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+many+cubic+cm+in+ml
    • 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_off0000cb1d.bin
c8169ee7e264574b806ce6b4b5c084f664d3fb86d4fb95df8d2cd94f2651e9b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1D 10324 bytes
font_01_sfnt_off0000e25c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 16792 bytes
font_02_sfnt_off0000fa6e.bin
fe63f9610e4114a1c4abc3db10af5003a0ac4df60e98d5b8ab8da2f91c3e827f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 16028 bytes