Malicious PDF — malware analysis report

Static analysis result for SHA-256 616fadf91911c80b…

MALICIOUS

PDF

79.3 KB Created: 2021-06-11 19:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 220fa65bf60eac1295559df099227276 SHA-1: f896c4e589fbad4ac520ccb2743b5e5e61e058d6 SHA-256: 616fadf91911c80b0d9a764a494d1e9ab9fa503f771a92d0e539d64289bc7602
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file is classified as malicious, exhibiting characteristics of a phishing and malware distribution lure. The document body, though heavily obfuscated, combined with heuristic firings like 'SE_BROWSER_INSTALL_LURE' and 'PDF_SEO_DISPOSABLE_LINK_FARM', indicates a social engineering attempt to trick users into installing unwanted software or extensions. The numerous embedded URLs point to compromised websites, likely serving as download locations for malicious payloads or further phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://drafthe.ru/uplcv?utm_term=mail+merge+with+pdf+attachment+outlook+365 PDF link annotation
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a88869a94a9ce20786b27167ebfa91a5/sefininoguvokenez.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3cb04d0d8---73351083339.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088004582d64---11070863887.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b871e76ad83---39000220446.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/f1fg6mnhbj260bhs4gm1il13sv/nevabujefoj.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072a905544d2---vawudiwom.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/9k1en5v3ve1i1oilr2vhpekvse/wigekikimabiwudaboxon.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160710cae3db6c---51010446947.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a39720f40dce4f31160c8cba876f380/67208852983.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/somixuzizewuwowuvimiviref.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885a18279a4---xusefuseduw.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/zorajixedodepuja.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aebfcd73779---89351193316.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/19293fcf1024961f6b3ca6b4a7d5d97d/27125114704.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b1005eef4a9a133a6809dfe45c757fbd/51302133177.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/84133345068.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 5992 bytes
SHA-256: d004878f93857daee5371308af7bbc54529a8f21bfdf249eaf36c7ebfb58f6d8
font_01_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 11436 bytes
SHA-256: 8ab2897848235bb400201bf62c9ff9b799c852e209175cae6bcf54e5b3d7baac

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