Malicious PDF — malware analysis report

Static analysis result for SHA-256 b606ff436a49eb0c…

MALICIOUS

PDF

74.7 KB Created: 2021-08-16 12:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3072764814c1c2473ec4d6cf1f3e4a16 SHA-1: 9ec79056f1ca6d85b22375defc72cfbc7a1c2b13 SHA-256: b606ff436a49eb0c6cd5e92ebeaf8e6930548a9cde6cad348c8c1fd2ffca6c94
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs pointing to compromised or disposable hosting sites, indicating an attempt to redirect users to malicious content. The primary attack pattern involves leveraging these links to deliver a secondary payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://seabeachthailand.com/UserFiles/file/85767457743.pdf In PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607812305b1a0---musofawonu.pdfIn PDF document text
    • http://axwelindia.com/uploads/varow.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/93200173146.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b7d6756a5---puvazupizaka.pdfIn PDF document text
    • http://drironcat.com/images/file/23027648603.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/wotizas.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/66361805186.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/wiruxovujiwetaxaroz.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609031c7082b1---sagumawegiwojilotarase.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1a01c5f3---23031489655.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751e5de9d46---71319312183.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/dfd9fe1f08b4d027df025aa3b5ab5421/funovor.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/xojelamofis.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-7/20210707200638693353.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/6kd6jlnqhvif937hudhp7i49em/54324558383.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/h5604so8vrdsufduu8jltpf9qe/49514670245.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/85469151747.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69254443372.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e4edd203e---70570560571.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/valediwifevivupa.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/86166242532.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/turagebegulin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=desigualdades+lineales+concepto+y+propiedadesPDF 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_off0000c30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 15188 bytes
SHA-256: 0095f865aa09ac9e0fcff65ef14052ca02b40f46cb4b8e2a5c268ce6dddaf845
font_02_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 10904 bytes
SHA-256: 628cba80015ac0fdc8471af3fa5726a702ced7024c657d2214d541f3e2bac17d

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