Malicious PDF — malware analysis report

Static analysis result for SHA-256 631746f8f6ee612c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 12:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dae50a6d2f74769f20c48d737eefe24 SHA-1: d7ce43ee586754d627f35b3c0c4f64b5e2a79a88 SHA-256: 631746f8f6ee612c54f3f7152169fdc11ab4249ededdbdc9c19b4130257f7ef1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to lure users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=film+interlude+in+prague
    • https://pianotuningdarwin.com/userfiles/files/wabim.pdf
    • http://lifebeachvilla.com/uploads/image/files/83079441486.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cc0e56942---sedobawafogix.pdf
    • http://pinedafoundation.org/imageuploads/file/nonezubavuke.pdf
    • http://tamker.hu/userfiles/file/gezorafizeravalufusuva.pdf
    • https://netron.pt/app/webroot/media/files/18989525870.pdf
    • https://flims.atelierleuthold.ch/userfiles/files/zurivajategewex.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/06e0cd87c12f963dd5cd47e667251d71/90575769144.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b402dcb3dc---85952488156.pdf
    • http://opuspoint.com/ckfinder/userfiles/files/piripizezesototi.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da738167e3---rozogusurivin.pdf
    • http://lianbang123.com/uploads/files/202109090659553119.pdf
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/14463092291.pdf
    • http://agataklimowska.pl/userfiles/file/fasodera.pdf
    • http://sakuragiramenandsushi.com/uploads/files/53883987304.pdf
    • http://playonathletics.com/userfiles/file/15802160925.pdf
    • http://www.pattyn360.com/upload/forum/files/batifu.pdf
    • http://yishiweb.com/upfiles/files/20210906_030901.pdf
    • http://tareeapartment.com/user_img/files/sozibepikosokizobon.pdf
    • http://fundacjahfg.pl/upload/file/zuzuwulavoxoji.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/dff9317d4ee2e5c7c59634c447822c0c/18391160547.pdf
    • http://chroscina.com/userfiles/file/velakumixelepafusig.pdf
    • https://bokaichenyu.com/upload/files/jewave.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_off0000dd0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 16792 bytes
font_01_sfnt_off0000f521.bin
e8260816264510f6569898bff57af114fb0512e54433903b9b3a5a1a024f7c76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 18624 bytes
font_02_sfnt_off000124a0.bin
f3f43962267b7bddb33c934f0518c5d3a643ee484ef92b8b2aca301924196c73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 10524 bytes

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