Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac931c78a6da399…

MALICIOUS

PDF

90.9 KB Created: 2021-06-25 21:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61f633d238215dda323c5bc5ee92601b SHA-1: 3e0a18b23418da076f233951a144728d7077bb2a SHA-256: bac931c78a6da39957a47f6e9c3edddf78681630a8c49b515e7c4a6b4e8eed51
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host malicious content or redirect users to phishing pages. The presence of multiple links on potentially compromised infrastructure suggests an attempt to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://smsenerji.com/resimler/files/3904437973.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/a9e029da3df26ab0bcf16927eda10877/89101096513.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160aef609bb690---pidepixurenuxudopisiweza.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/95078b3a6ee700cf4480acde3b522140/99022349285.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e4872621acd127fc605a6a23b120d339/bezikakusik.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f2297df0d---dorural.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/984c2515d45e25c6914f045b7f4d4710/tisijaj.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c338dab7b4d---13344715433.pdf
    • http://guanzhuli.com/userfiles/file/43261343339.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/2s8fb4rvjjkk8t57ng9umflpr7/gelages.pdf
    • https://micsys.in/userfiles/file/5081726119.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/9mh2o284k6c366a4apnhouuk1c/51196326077.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2b67a091b---81415210560.pdf
    • https://aradovan.com/userfiles/file/2626428992.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836f0f6252c---fadujenigunujanu.pdf
    • http://alemotta.com/resources/original/file/77703122654.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c219e551280---xakubegotenapa.pdf
    • http://zonazero.es/userfiles/file/31830687960.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608363eeb2122---razogexi.pdf
    • http://bulk-supplies.com/userfiles/file/16364402683.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/29j1lslrm9m364a6esmtrpk5an/fusaluxiwodomadadive.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c770f334242aee0330b6303dd6419924/69894416079.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/22944199427.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=kinemaster+without+logo+for+pc
    • 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_off0001025b.bin
6c595d05c4c4e009b05bd145c968dd2ac6118479c04a2e1d5e974c3d0d1fa030
pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 16372 bytes
font_01_sfnt_off00012c8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8C 16792 bytes
font_02_sfnt_off000144a3.bin
dd42ef0b0f10485bd3cb1d9a36df0dd3b15485175cf93cc72a76a73208876e40
pdf-font-stream PDF embedded font (sfnt) at offset 0x144A3 11104 bytes