Malicious PDF — malware analysis report

Static analysis result for SHA-256 3870b7f2f8dcd3fe…

MALICIOUS

PDF

113.5 KB Created: 2021-08-11 13:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e1211a97c7080d852de5e76161517adc SHA-1: 4e10fd545a0b000cd5ceb55c5722d1217802f07b SHA-256: 3870b7f2f8dcd3fedbc57b61e03f83dd7d31d9b75273f7d8f5a553e1accba385
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pixomot.ru/uplcv?utm_term=manualidades+con+material+reciclado+paso+a+paso+para+vender PDF link annotation
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/34323218653.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3b638c2d0a281a54969fef1ee3d55c79/25306896972.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/33836081337.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f57bbc476a73ba48cb88f077c230fe8f/58477985325.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf7a21002---74725849328.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/42069545334.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/67356678020.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acb8a7376e---11989495646.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4c0e62412---91293013314.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/rupod.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/jitabuvud.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4a1d9f4f8109d192c86c886902bda1b6/68838047547.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/xudotegi.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ju9fspaeoer1r89ktosnl3o3lq/wowarirozererinenupolebu.pdfIn PDF document text
    • http://blatt-gruen.ch/files/zalusaroxadinena.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4256c3f579d3c67396b52d9cf0edecf1/neloparipenoxiramivap.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/634420164.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/87762652484.pdfIn PDF document text
    • http://fitviewer.info/files/file/5010002557.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/sebisebanojetevufa.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/kusakagoligojadosonivi.pdfIn PDF document text
    • http://langmypham.com/luutru/files/68374549451.pdfIn PDF document text
    • http://proxima-design.cz/files/file/20544505137.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/xolewevujuwavusodufeduw.pdfIn PDF document text
    • http://web68s.com/upload/files/lomikapupuke.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E63 18548 bytes
SHA-256: 245a9fd5fc5d04be61317a1c2e0ebc68273c74d457e1e5615fcbcf55833ed110
font_01_sfnt_off00016d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D90 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off0001839c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1839C 10836 bytes
SHA-256: ebb6e6e6a343a0015a7f1828e5084793790a67daefe9b482c713a4298fa74e75
font_03_sfnt_off00019c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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