Malicious PDF — malware analysis report

Static analysis result for SHA-256 820e7fe5b5212a6f…

MALICIOUS

PDF

91.3 KB Created: 2021-06-28 10:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: deb4968f5a7d33a08da435d4286fddaa SHA-1: fc9f44bc32c0363c3fb72df54eb0d25e40486918 SHA-256: 820e7fe5b5212a6fa665fdd4ffa7dad5867ff61d9062dbf19e93c582d777541b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. The presence of numerous unknown URLs hosted on various domains reinforces the link farm characteristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e692cb9f06---95406632157.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609009efdaf83---sipuxulixov.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/c54e274c30df274a46d805293c752f10/wimiwifugepara.pdf
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/vuluzabesi.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/j5l3cvr66l7n7279fsnfo3nqj4/48441253867.pdf
    • http://polimak.pl/userfiles/file/17660017665.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/7658d7291428a9e42aad9dfdc98c6f59/sasobiledobig.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f07c6e230---mugiv.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/nod8je0tq4keo7gi3ik3uvff17/52280388807.pdf
    • http://alibabashipping.com/userfiles/file/5801951727.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/bc0c138c62651e1775e051f820e9e511/gabadomopo.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc73d01de9---xonolepa.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074482b3a074---nanarisogewuvobinozixu.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9946987cb8---belarabufaga.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/b2tjb67rjhulfqduiu749nnabr/22934501119.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1f92c0f7---80739161870.pdf
    • http://adance0112.com/upfile/editor/file/rapitetepajegudeluvowotiv.pdf
    • http://luckdidea.com/ckfinder/images_store/files/49710677484.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/14f9bd72f8bcf79e77309c1f55f75e7d/12430191949.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608443bec31f5---76460430785.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/88a059548a87a2ca6bb3d3992f4ded69/77906374899.pdf
    • http://infunplastic.com/d/files/65217993335.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8bbcbaba18b3c251d26a2355074312ff/xidakinixiwonazefodojowaf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=methods+of+isolation+of+bacteria+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_off000101df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 16792 bytes
font_01_sfnt_off000119f6.bin
504333f3d7f8442765d039e70ddb287f62a7b639cbae1524a1821605e2113e2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 10852 bytes
font_02_sfnt_off000132b9.bin
166eec3b79cd354c3fef1fdf6153ffa6da932caaf7f6e2fe21f49675b491150c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132B9 17732 bytes

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