Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac79e323e2e6a72…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 09:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 07dd822a98508eb71b7784410bf0c335 SHA-1: 1f5aba3f9ff275e6f7bb9be4c7aa87a1655ea963 SHA-256: 0ac79e323e2e6a7281290b4740c68dc7b275de8bfa7c6b3b89ceec6caa378fd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external websites hosted on various domains, many of which appear to be compromised or disposable, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=cold+war+division+map+worksheet PDF link annotation
    • http://cansuyu.org/resimler/files/21369158040.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/33555584423.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4095fb2951---91356635944.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/bufijezozaperaretixem.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/79060049755.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/k00494vfr7tlshg19u2u3pa615/zubodoxibosijopawo.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/867408d3229ca45e35d509c9fc48e93e/bejugukewizimumufarujode.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/65978402172.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609acda76faff---65410583183.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/gased.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/jinonuliva.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/juzaxevavotofur.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/fa71d22546876dfcec6a22f2000ec5f3/44840213460.pdfIn PDF document text
    • https://t2sc.me/userfiles/lirad.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a49fbaf4126---68315840235.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210824124219957.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/gesavepevof.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/salexikowosevox.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/94303062476.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/verupixuxag.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c2ed23ac6---welozewatuga.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/raxikirizela.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/lonasowajorasezugesowiru.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612e1666292ba---48784319842.pdfIn PDF document text
    • http://cwesp.biz/upload/file/fosavema.pdfIn 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://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_off0000b6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DC 10932 bytes
SHA-256: 244d0823f0b9d519b52e84d2c2bed463e6609ed396b395bab2549892cabcbb8b
font_01_sfnt_off0000d00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 15420 bytes
SHA-256: d9cf01a9097e69b2ba09a17a85d61c17a02d93f7f2c022d2b3898e237473cf17

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