Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a7cdbbc0bd692c…

MALICIOUS

PDF

86.7 KB Created: 2021-07-03 05:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85872692d98a75ed2428cb237d4e6e45 SHA-1: b17a54369293e373742e6ef898c57630933e0396 SHA-256: 99a7cdbbc0bd692c9fe1af00eb926a7297c017ff825ebd1963ac766675154ed1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d948c54c829---muzuraliris.pdf In PDF document text
    • http://aucoindeshalles.fr/menu/file/dikivofegedebusafemigo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b139684f7a6---21860442705.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/12948842297.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/62849782287.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/88240540292.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/8429412139.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bea436236---seniwevefixevetegakan.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/b379f1546273a39ae042ad23179cc43d/78140606270.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a944d53cfe7---11430643148.pdfIn PDF document text
    • https://areicon.com/images/file/baxosefepig.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a14ed4ce3a868910ca6d4460020f85fb/22104352094.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd5d99d5f---benoganixiverim.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e1688de8---wuxesugirinakanupu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b591d568640---57117490854.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/a67rt4d5m4e6ee4j03fd2sv6jj/veponotajukex.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nezesijenizokubokipusog.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wepep.pdfIn PDF document text
    • https://computerzone.pk/file/vokonozumijunawopekikag.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a564502d834---vipirowuwifemirediramip.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/42288126748.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b02f76d740ddd9f8fce1e38faecc4059/68645352799.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821edf389db---bemowosatimiwolubimasexa.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/20254491626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=imperial+assault+campaignPDF 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_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 17664 bytes
SHA-256: 5f330bce651edd755bfb9d059cce3609a1035a52c3a36a93596fcaecb9c41e85
font_01_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13539 10648 bytes
SHA-256: 417cb69c94fe2c79e245dc910eea7ec2ce94c0dcc2a34496f9e37ecf1a04f29e

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