Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57f186ae8587d92…

MALICIOUS

PDF

83.9 KB Created: 2021-06-26 20:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c996170a5d6bc058932cad154bab5f7 SHA-1: 596dba001e9920f893a5902b5322bab6ca3fdadb SHA-256: c57f186ae8587d92a65083b4ead7a191ab117523caada7e2b1d4e2787ef9e8eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content or phish users. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=what+does+lls+mean+in+texting
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072c526d2d2f---seludalotudewonoxiwol.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1f58efc6c4e5752b3afd26d70d49e13b/nanomakig.pdf
    • https://binarbaid.com/public_html/userfiles/file/45082827308.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160718a170e316---6054261133.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608f09374c605---tulileresewiwerofaluximi.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160baf3a6728fa---93492385070.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609082e06a84a---87214371694.pdf
    • http://weifong.tw/fckimages/file/11233691551.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9ba15ca8a0e3d593ec137315a77cd006/24052562649.pdf
    • https://aronabritcan.com/userfiles/file/50710450981.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/7344ck3ntq4v6n0qadhib3h1c8/21652114246.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b93a6267a70f378a3bb97f4f86cbd9bd/pefolorawe.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160954ed63427b---debem.pdf
    • http://astro2sphere.com/admin/images/file/kobajelomopilij.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/mufabe.pdf
    • http://aucoindeshalles.com/menu/file/77171499810.pdf
    • https://bucatariizidite.ro/printuri-fi/files/57168160067.pdf
    • http://bi-acaovo.com/upload/files/88466863957.pdf
    • https://menu2uplus.com/images/file/16720124173.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/kiliwifufu.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ucjho4bov4co1f1esjpu7m50no/60481411510.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fd9def5b345c80f6c659b421e351a700/65116818102.pdf
    • http://accessprecision.com/userfiles/file/komewo.pdf
    • http://stalmont.eu/userfiles/file/gazokoxijedikorilufoti.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_off0000e4b2.bin
e26acc8efea62ada31beeeabb6806274ce9e427f999bbfe3f0c145d0309b376e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 17432 bytes
font_01_sfnt_off00011251.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11251 16792 bytes
font_02_sfnt_off00012a68.bin
e3ad2524e2deaee333e96835c2b388b1ccc0f5c14dbaad7cbd17122abc13adca
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A68 10692 bytes