Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efe040275fb78d3…

MALICIOUS

PDF

84.8 KB Created: 2021-07-06 12:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8adabd915ecf4042c2d238d5798f3c33 SHA-1: 21d0042344b97adbc3b9e33cbd3356a1736f2b4f SHA-256: 5efe040275fb78d3c8fa8a747207cd221efda59a61897e58b9253c08f48b2a1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7665a827e3---76458530082.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072367e803ef---forib.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ac6abb17ec98352d14f97545e9fdec35/wetadubek.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/puwagijojerejerexobaxi.pdf
    • http://aliglobshop.com/userfiles/file/72927562979.pdf
    • https://bostoncake888.com/UserFiles/files/kifujugufinul.pdf
    • https://al-farh-iq.com/upload/userfiles/file/65871546617.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/96b617cbc3b2e7c7472d5907063c5190/23333952150.pdf
    • http://cdhsalumni.com/clients/28864/File/sexosugazanateboluwefopaj.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4626e3a7c7ad9b1b0f5db8adc25582a9/27912602632.pdf
    • http://eko-inwest.eu/upload/file/bovafizeporuvidipivov.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d855c8e56---65900492323.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/fu79s622s1j38bj8g5qqhd6ei8/83217684169.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074375bc62b4---fimusosinolateso.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/c5d9b5359ca05d46e86219efc46b4673/29072089356.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/551d1e3591de10c25e80268411f5becf/lukulaj.pdf
    • https://prairieroseclothiers.com/FCKeditor/file/talokedifevujirura.pdf
    • https://thefertilizerequipment.com/d/files/70561691360.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c7b45d7953d267200c9499f728ebc1d2/fenedugop.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/bec49d182d57682ad28dda6d48f435ee/tejag.pdf
    • http://hrdiborice.cz/erucom1/files/files/wuginuzibexowipifeve.pdf
    • http://dzbnf.com/upload/file///50112798991.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/21046d91973d0317acf2feb91c2b949b/99096098722.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=electricity+volts+amps+watts
    • 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_off0000e7d1.bin
0988c4aef7681b8e42963cabe63b348b5994af56f96b950ed2748b4819b1ac4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 10680 bytes
font_01_sfnt_off0001006b.bin
41e108c54ec4ea88eedeb250ad26df018c5f34b8ca50cba8f11a72831bcc605b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 17328 bytes
font_02_sfnt_off00012db1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB1 16792 bytes