Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb117b21815f6de…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 10:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c203ebd649d134691e7b1516c00e868c SHA-1: 208a3c0bc98209b7919b4918efb0272d41d679b9 SHA-256: 4fb117b21815f6deaacad30ee8d49dd670428ee44189363e5c5ef2d4d040c92a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=quantum+mechanics+mcqs+book+pdf PDF link annotation
    • http://hongpakthai.com/ckfinder/userfiles/files/nukazodokovejipawubuvanu.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/jixanubegodurevawovawal.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/19552370465.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/62720603809.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/tumavusexovifadazepuk.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/86io8krd024968ua8brgnjeba5/jodasijuzawuje.pdfIn PDF document text
    • http://sooclose.eu/upload/File/98996522867.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410fcbdce72---69926823172.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613055066a2a8---fotilaxulegikawodib.pdfIn PDF document text
    • http://test-immo.com/file/21526788195.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135501f0af70---vovux.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/73101998729.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/14152736527.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q8dr7u5lg7r40fni189s7khnm0/xewiweweboragej.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109151458396929.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eef7d09808---pabosuxazez.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/fikavuzujewupotiru.pdfIn PDF document text
    • http://citty.org/images/uploads/file/wofafibegov.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/tevadugemulivo.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/7432110824.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5ppia2t90sucf648k70nemi6hf/4641360542.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/66723818365.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_off0000d1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DE 16304 bytes
SHA-256: dae7dbcc55cac8a59df4a1c18c226deda53cb771ae87166debbeca9da3c9ee94
font_01_sfnt_off0000fc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 11276 bytes
SHA-256: b069f6dc7d9ed8c91228fe027e231991992221ca223c3a4ded99b6196656c68c
font_02_sfnt_off000115f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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