Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb86fe044852688…

MALICIOUS

PDF

95.2 KB Created: 2021-07-04 13:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8c447b17c34d790cb9f62fe0f838fbe5 SHA-1: 331c9ae3ffb6509bbb5eb4e58e1a5cd8bb0da869 SHA-256: aeb86fe044852688234327aa578d243076d60edf85f40e104b72a58233eeff57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://goksirkrupskimlyn.pl/img/upload/files/99589106650.pdf In PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/11d756b4d6878d8215325970a3830c43/95573028373.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/nejuzomu.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/8767763831.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/peo0pmm7vurn5tnu90iv5g3fr0/68371234611.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/kunitugo.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/jjfs3218tgs3quvhm82bn823i7/46521670713.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/3469095926.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/69508589109.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0205160cec---fedomex.pdfIn PDF document text
    • http://kalikraft.com/images/file/bolimok.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/ziretukujenekatuvunibik.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/gusutunenamu.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/ba232afd7e7f42d6e47449d045d51422/fokugi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/mlf47sfomsrmddi9i3mfq9gi70/mewalew.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/40525401044.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/lisilej.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/74720141526.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de660ab7a5---saferutuwox.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/48974501763.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cfc58137---37969511522.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a3fc7b5b79cbcc79eec73ac1d3d0401b/rijevubapiwobewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=list+of+theories+in+political+science+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A8 17084 bytes
SHA-256: 15e8a3a25c2d275744b9a80bfbab683f5d5703997457161d9dc69c7cfae0e744
font_01_sfnt_off00013f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2F 10672 bytes
SHA-256: e285d752ed3a0aeb6734c57718cf791919440cda2cca046ef5722d427faa46f3
font_02_sfnt_off00015791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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