Malicious PDF — malware analysis report

Static analysis result for SHA-256 30116ed3f7e8351a…

MALICIOUS

PDF

80.7 KB Created: 2021-06-05 04:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42b97679c645722941d8b4715e0a6b5a SHA-1: 5e973b9e2df697d4464b8ddffee3243bea8d56f9 SHA-256: 30116ed3f7e8351a6c23ac1a14d117d3a5816c4b2ac398cf719c5b1b34818010
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 phishing and trojan threat. It contains numerous links to external resources, many hosted on compromised WordPress sites and disposable domains, suggesting a distribution network for malicious content. The document body, though heavily obfuscated, appears to be a lure for downloading a free executive PDF report, likely a pretext for delivering further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=o+monge+e+o+executivo+pdf+gratis
    • http://am-assets.com/aom/magnolia/userfiles/file/71218657803.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608728e44bca8---kitedumeguwawebozibe.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c56045b9b94439346c74ea6aaa68ee3a/sowabudamopuxi.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/70livhu85hq57q2p56tjh7o5bl/82201717819.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/91555470104e63aa4e096356f463493e/58562132423.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/jhl3lkcd9tl97gb1dccg51gjv6/nofujufevew.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b9532f079---65360164042.pdf
    • https://m-astar.com/UserFiles/files/82120279857.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/nekipudad.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/8921dedb3de20aa9e0f7d4f770a9e812/sekalusibev.pdf
    • http://nw-line.ru/generic/uploaded/jiwebibusipiminake.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca3d054029---mumasoguvifabokejetof.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/19a9cacbde0117df172e32dd18ce72ce/54933106635.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160763da12f4be---87542346102.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609638f978bee---nufelugivewosoti.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607596c456f28---77180425175.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/45f4560ca37afc20ccf7ada7c38590ba/90495878545.pdf
    • https://teyadegitimvideo.com/calisma2/files/uploads/75834332927.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbcf.bin
5581dfe82617e8a9ee0e8a6f58fab0f2f6bd78825dda398eb4045817ea9ef6bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 5596 bytes
font_01_sfnt_off00010ed5.bin
9885db9ffbfbc8212e2064ff20da886924533274dbc813e8386e767bce0a2a23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED5 12524 bytes

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