Malicious PDF — malware analysis report

Static analysis result for SHA-256 2442b6813073b195…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 09:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01fc2f371dd045c237c8cd4d89c9072c SHA-1: 8ad7588617047eefc6ce8a0089fffa1b6a9cf532 SHA-256: 2442b6813073b1953c9407e3a63f7f3e8d9019c03740035e1e403d2fb9860bde
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with a clickable action trigger. It contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://laborke.ru/uplcv?utm_term=lk21+captain+america+civil+war PDF link annotation
    • http://saothienemb.com/uploads/images/files/fomavobimusezamad.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149913937593---sawufemazinovuwafipibilam.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b38b891630---73859630529.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136485e80097---34381563140.pdfIn PDF document text
    • https://phunhai.net/upload/files/98141010142.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/mimeramozakibu.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/muban.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/72828442457.pdfIn PDF document text
    • http://ned.ru/uploads/files/33443186565.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zefoxoxel.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/55641606925.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/69308284550.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/mamerikuz.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/76406686089.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/53673486330.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/38169353865.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/65725824967.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/15272772717.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/furodawasogenet.pdfIn PDF document text
    • https://suksesunited.com/contents/files/90079829687.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/75018233481.pdfIn PDF document text
    • http://salespate.com/userfiles/file/kenezizunagix.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/39121543978.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/95342392329.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_off0000b14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC963 10620 bytes
SHA-256: 0ad3d80380680a9496aa039d07e2e18984ca99b0f297cbef3b69abb6880242dd
font_02_sfnt_off0000e1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C8 14132 bytes
SHA-256: e791c7b5cc38466e792a367d9f0dc8e83ec5c26ebc107c0ff5ce05a04665a724

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