Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcb8b91d27cd5cb…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 11:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d240372945d67ab320c66e5eeb18a1ef SHA-1: 09f8ad7bd1fd79bb76602060834cc2f7629257f0 SHA-256: efcb8b91d27cd5cb9fc09cb0829155249c849e59954198ad3e48a18947f28945
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 or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ayurmitra.com/files/file/jisejirikaxuje.pdf
    • http://agroanaliz.by/upload/editor/files/71688343534.pdf
    • http://www.miyadenthai.com/image/upload/File/vuvuzuwafolidope.pdf
    • https://snf.styleguides.ch/userfiles/files/91611603058.pdf
    • http://kfnmsz.com/upfolder/e/files/20210910231304.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8f5f81e80---80692233486.pdf
    • http://ct-tci.com/cttax/userfiles/files/xijulazonizani.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed7204e01b---47819067005.pdf
    • http://timnhanhonline.vn/upload/files/91936538422.pdf
    • https://konteshamamotu.com/userfiles/file/60730273145.pdf
    • http://kp-technik.cz/ckfinder/userfiles/files/22341121455.pdf
    • http://magic-mugs-factory.com/uploadfile/files/genorisapanudosudewozi.pdf
    • https://mintedimages.com/ckfinder/userfiles/files/68702200.pdf
    • https://adurucui.com/ckfinder/files/28196883519.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/jijamin.pdf
    • http://marathon-gexin.com/Uploadfiles/files/28938733973.pdf
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/pubawekozudu.pdf
    • http://vagtteam.com/userfiles/Files/39920762644.pdf
    • http://eros-arena.name/eros/userfiles/file/nuvefudokuza.pdf
    • https://alistairmills.com/ckfinder/userfiles/files/xovalet.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/203952ad3a31ffcdb0e2e15e5637c6be/36986433853.pdf
    • http://nhatrangpalace.net/app/webroot/upload/files/navuf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mi+game+turbo+voice+changer
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba50dd879---22104663443.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cca7.bin
ce74737476e6be923b268fa1f4f4b6b508d850e362f2f000bb6f8e888c5675a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA7 10760 bytes
font_01_sfnt_off0000e540.bin
d445d5ee86fdc84a1a85d9fe96b0453f73646c82528fc4558f8321e023b85180		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 21128 bytes
font_02_sfnt_off00011c8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 16792 bytes

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