Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0a74d46589d617…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 06:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5546df7633cced9284f2d6388d8859d SHA-1: f25bd9ff404424da45f6f563c367a8c80005d185 SHA-256: fa0a74d46589d617699e6092c42cd4ab01b022597752307158975d9cadde9c7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bahispesinde.com/gnc/veri/_files/sewapasi.pdf In PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ad2704d2df2818e15f922b340e47f2bd/zuziperebalajisikezu.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/gawazeniwodog.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/72417253982.pdfIn PDF document text
    • https://people11people.gr/uploads/File/nugogavuwuzexemeruzixuju.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/9150188768.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/xivat.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/vajudijujijirojoduxojoda.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/fasobifojusemofodutisujez.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/xuvebalisezob.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/dodimiwabajerumawudejeb.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/vugike.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3qqfm752d232j09b2oln0vd4bc/3314104929.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/46402701372.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160910995c2736---62231074821.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/35eebf0b0d4aa354bd861981a2fb5a1e/wezoxo.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/54281531b775ee60900d3758cb77caff/86591753304.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/67370922782.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b62e88323b4f0f42780c655d9039d59a/lapitisoge.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/59779518977.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/gafiximire.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/munotubuwa.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/wokiwonowunanema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=present+tense+worksheet+year+6PDF 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_off0000d020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD020 10528 bytes
SHA-256: 91eb87ca2356d5cc4de5ae72bff70c5a7c17ff0104c8c6d14ab74a68805982e7
font_01_sfnt_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 17704 bytes
SHA-256: 2923ca258c0f4afb1acc94fd0947b1c4179a463fe6d93dbb6c3020e1914529c2
font_02_sfnt_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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