Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b58d00aaef36c4a…

MALICIOUS

PDF

100.1 KB Created: 2021-09-16 11:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a14f61594aedea24a0af8a6af3d9fed1 SHA-1: ad5771a24c8eec5f8dd0b85c0e3fc624a5fc7526 SHA-256: 5b58d00aaef36c4a2f4b820891e5b814865821a8a6370d7ffb91ea5b909eeaca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://casier-a-bouteilles.fr/file/5534982048.pdf In PDF document text
    • https://hideab.se/tc/Mediagalleri/file/27192981187.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/4063845473.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1630732296.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/zeralagijuto.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/80216913812.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/xiwugafopukapuwo.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/fejugifiwukexoxizejaze.pdfIn PDF document text
    • http://freeorden.com/media/file/23287880863.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e674162bb---nikab.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/49132522907.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7b32f7dac6496b188344176bddd3aa20/71275659380.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/aa661e5cc1b4663fcf9ce386bb4bd3af/57944043765.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109141748444533.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/grns84gphorioi5d1et8ul8b71/teworemalozodo.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7f8b3c9de3443fe2f1f1574edac1f355/zamoninikeg.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/b2cffd5541c765b475698e49d339ad6a/19423047864.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/rakuwifex.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/41307433565.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/fogev.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/vejamonaxigexupesekap.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109111233135447.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132a78af2e80---zodatubomisa.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/74135670731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lecteur+photo+androidPDF 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_off00011f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13727 10452 bytes
SHA-256: cb46d8d6942e8c3d610123e7dfb36b3f05831176543dfe9e385396419e86a33f
font_02_sfnt_off00014ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBF 20668 bytes
SHA-256: bdaa33d029c91cd1a71a01355111d45946fe6e3ae811f28e458116a144a8460d

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