Malicious PDF — malware analysis report

Static analysis result for SHA-256 105f965fd02c918e…

MALICIOUS

PDF

142.2 KB Created: 2021-07-22 22:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e581b5318b6b6b69df2b899a6068c218 SHA-1: 6200f5b599c33db36bc6817b35a9b0d8515e62a2 SHA-256: 105f965fd02c918e7036264d6044dad23f62a7f714b82cac811706ec2e5210a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The embedded URLs are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096e1a6620e7---39745806454.pdf In PDF document text
    • http://goodslib.com/userfiles/files/4538038094.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/514f1636ae36e8e646a2841f8ee3a426/kilifivuxurezetatebuvison.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77fa0f0376---wititeka.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/13907360833.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/tiropebexafovanemajubu.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/61191395333.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e3200481b---lerolurazor.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095122c11893---bekabemejomomim.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3fabe82c487e24fa962b8fca8da6c563/74911782618.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5ae983a65---buwixowozolufodumotime.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/hgp40k6he2kivphrlqlo5n3mre/7956010638.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca36eb84a---sogivi.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/2871006510.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b673b709ea427809d3df23f682348fc8/wefuzitiwuk.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/fce40c4ad0d11d9f2b95ec59ce76889d/jenegezejajedurovepur.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/36305f12616c46d787cbdd263b016f8c/rozonagola.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e640ae023---jawexipusujebebajoduke.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/63722835793.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/40459889332.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6dd18d3b6---jegaxizugunelokopuderami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=andy+bernard+i+wish+there+was+a+way+to+knowPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3FB 17328 bytes
SHA-256: e588e3c5ec80c8aee933627eacdf1aeb0d7db9ef61014433a626bd99dea5454a
font_02_sfnt_off00021160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21160 10712 bytes
SHA-256: b6fa2e860a9027ac75283d668b747abca0f06c470ba0c700e2af4b74a37a9bb1

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