Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6dc598e1a57c8e6…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 16:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4de73cfa50ed5610a7774ff639cf209e SHA-1: 4349e694ec4eab7b64ae7a7ff8f814b6622b529b SHA-256: e6dc598e1a57c8e6a6af1d1e21e9e40c17cb5b6b824e6e6499608ce9428b85e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=android+5+inch+murah+berkualitas PDF link annotation
    • https://projetovm.com/uploads/files/60205144652.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e045e946c---28498979880.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/bezamubam.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/24111981367.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/pezilukepazikanoganelulo.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/25ff5d2e7577d48c9f89bacede01a488/74825271573.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f3db0110c61aae8ef0b4bdef182b7ac1/sumumowamuponap.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613025de48339---36043131847.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/63202701760.pdfIn PDF document text
    • http://polletnv.be/uploads/files/suxidejekogaji.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/vekokin.pdfIn PDF document text
    • https://sopkambing.com/contents/files/29055021876.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144334eaa2ee---15682816540.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/79101691715.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/ditumozojabitenagurobosug.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/59180450723.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/72nlgdtapni45tnjgstq0ldj90/90492326864.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/71875898392.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/xirupedixomafikugiba.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/vopejojepomupi.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_off0000ca45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA45 11084 bytes
SHA-256: 1a0fc586bccc6451911cf3bc1106334284ca0f0013b8e00a0826662c60b185b5
font_01_sfnt_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 17324 bytes
SHA-256: baf7fca22264490380e40f5789b4f25ba8dcf76f4cead5e37f62a25c965eb091
font_02_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1