Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad47ffab63faf9d4…

MALICIOUS

PDF

79.0 KB Created: 2021-09-28 11:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 65200b8a83bce9d761e7349a93f9d1a3 SHA-1: b3e7ebe1bd6996594ce100d5f7a332918565353f SHA-256: ad47ffab63faf9d484544064685134a352235ac764866a43e209c684c177ae6a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://soundspace.eu/Upload/file/57224325809.pdf In PDF document text
    • https://isitekmuhendislik.com/userfiles/file/xigufuwusagidenupu.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/32132248679.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470c0b49c72---9619131124.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/nunuti.pdfIn PDF document text
    • https://onecre.com/images/content/files/64130958884.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109260851234756.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/79145474783.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/85397736479.pdfIn PDF document text
    • http://e-menu.hu/editor_up/jedezaxewup.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/36423305802.pdfIn PDF document text
    • http://rococosofa.com/files/files/81747637340.pdfIn PDF document text
    • http://kam-era-man.com/wejamipejetejagudazobu.pdfIn PDF document text
    • http://grafitym.kz/files/file/gazalovawefujuna.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/bamodikowurodizuramusega.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/jofixudowubir.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/40672645020.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/3c1792760e58dee286ce7a9cdcf6408e/biwekipaxixelumiso.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/8152611019.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/88577401815.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/joxepuli.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d86be45adf---79489280253.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/63095167301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sd+card+partition+apk+no+rootPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
font_02_sfnt_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 19960 bytes
SHA-256: 35e2bd0fb139eb216f682c7001cf349f0ba8c96b46c25cb5e0b92c21f04892b6
font_03_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 10328 bytes
SHA-256: 397f5009723b12328c05675b5eade45b7162876049839788c0311a4f60b2ee2c

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