Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdc049733aa1cc7…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 19:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a4d3b43f589d3d91a7b375e425fe014 SHA-1: 3015a7743b7208a067b7ae7bc5e29318271d5031 SHA-256: 3fdc049733aa1cc735c631fa2987e80c5ca3f1f761d9f236b19686d67cd2401f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/3d4bdb2c2c18715804ee71c3747a2bdb/43176576515.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/pajobafisakufedidudusoga.pdf
    • http://dryoucosmeceutical.com/userfiles/files/pabakiwubojobageme.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ketj4bdp5f2mtjpkf75rlancql/57755810799.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46c43129cd---wizemajujow.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079cb1b71395---67061382854.pdf
    • http://www.como-grup.ro/fisiere/file/kexekomadonadujegedol.pdf
    • https://zhongzing.com/uploads//files/202108090443395989.pdf
    • https://burgas-remonti.com/userfiles/file/berelalowulosivip.pdf
    • https://cncostruzioni.com/userfiles/file/4783425088.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c926a1e290---rubam.pdf
    • https://wecareprogram.org/images/file/41671963432.pdf
    • https://bbu.vn/Images_upload/files/tetabusozelomojavawone.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160add593916c4---fasovafolivib.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/genepebemomekekomimijej.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c636bea644e---petupemulele.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161135022df2e0---ditaborifi.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/budasubezitobijen.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16094a74da833b---86464746291.pdf
    • http://nowator-zpu.pl/userfiles/file/jojuvafugudisiga.pdf
    • http://martonaroniskola.net/userfiles/file/sugirebevaxetelolonozubo.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/073d1c78588b8009e6e4a119c63d2e0b/60630169339.pdf
    • https://ozmutludokum.com/userfiles/file/72473004409.pdf
    • https://xanbiente.de/userfiles/file/zafavi.pdf
    • https://meesens.be/KrMee/Tekstverwerker/528420440.pdf
    • http://euro-ex.net/images/blog//file/riwipujexosenoxoxu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=when+you%27re+expecting+twins+triplets+or+quads+free+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_off0000d7a5.bin
2bf4c8b248658fc19d28aadd67309d0f67beb9a7ef1796d777974d2159f59698
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 11476 bytes
font_01_sfnt_off0000f252.bin
4e2cae202fec586abba66fd11303fb3261edbade814274e4b3d726a0df3b8418
pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 17240 bytes
font_02_sfnt_off00011efb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 16792 bytes