Malicious PDF — malware analysis report

Static analysis result for SHA-256 6160ef4ec6138ea2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 03:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 20f8ad80b708f8fbf0be92074785833d SHA-1: 111ba449db107473763383fdf60394bfa539bb27 SHA-256: 6160ef4ec6138ea2b4cb98788e5b11b16a2bb940cfb91328d69bd111bc6d53a2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. 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 0.9975

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://huntic.ru/uplcv?utm_term=how+to+get+mario+bros+on+android PDF link annotation
    • http://antonio-pelella.eu/userfiles/files/77885874704.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/72455543956.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/pularapagedexet.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/juvufoguwofuwunelolinuj.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/21655666054.pdfIn PDF document text
    • https://33mobility.net/uploads/files/99990886526.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/vitoba.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/50122621319.pdfIn PDF document text
    • http://podarox.ru/public/files/sewitadazonuzikim.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/63389229608.pdfIn PDF document text
    • https://airshow-bg.com/file/66158268506.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/gabubaganowidu.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/bofewosi.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4af13d193278135e709a300ff89c932/97829556836.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/fupiriwetifogaririnoz.pdfIn PDF document text
    • http://enricobarraco.com/files/poxidu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137a75de0789---pizuwesulujaputokew.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/40954130866.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/45473363113.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cmaod73j09hs0c533j0fppmfp7/90686726514.pdfIn PDF document text
    • http://byecook.com/ckupload/files/potepuxoxunorekesuzejowen.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/rexabedokakuzawanetisuk.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/dimaruvelamepilubenapaf.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/53574112062.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/75290667324.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_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 16968 bytes
SHA-256: 1e8b8fde33ccdd12ec55c3b974aa6e26fe4f713806e4bcd36237fd91c7ee90ad
font_01_sfnt_off0001079c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 10764 bytes
SHA-256: 4040c62c7c119b40b4d3eb5a6cf984ec64c188621f5cb09da16ff21ef881267e

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