Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0acb5b4946049b…

MALICIOUS

PDF

91.2 KB Created: 2021-06-29 22:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cda778b1b1c0a5bbfdd005e93082eb16 SHA-1: 4d223f8c458c540318c962b5d4703a2df6e8c986 SHA-256: 1d0acb5b4946049b8769339f1e84a89433a1edd751fafc407537f53247954cee
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. No scripts were extracted, but the structure suggests the primary goal is to redirect users to external, malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b5727700---kemexiwodumumevefemafeto.pdf
    • https://accuratesearch.com/userfiles/file/damiletasokoxevidovor.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/51b66018152d5ae4eb4245dabf37c637/zaxipupuwivaretesok.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/847598008831fd6a5e9703d2e5a549ed/mupop.pdf
    • http://curry-box-deluxe.de/userfiles/file/pudurojeta.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160828cdf14a0a---96559374725.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210607004232.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/89e5a4cb1dc9a82224a0050d8cb0960b/rakijaku.pdf
    • http://irk-yoga.ru/upload/files/gojozewovodedul.pdf
    • http://www.oiseaubleu-promo.fr/userfiles/file/10842319688.pdf
    • http://jiehuist.com/userfiles/files/83221755837.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cafd6d7862c---nokevajolorej.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/71e05e78b94b3b891e2a67afecdef724/lukuvegokakobi.pdf
    • http://gemwishrs.com/ckfinder/stones/files/futikuvoweteroxolirefuj.pdf
    • http://toonesk.com/upload/memapo.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6b1924a19cf62de8c59e35b13ace169e/riderasibavepeta.pdf
    • http://fipjp.com/userfiles/file/61667199106.pdf
    • https://egf.tw/test2/images/file/71387011647.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a07ab9354b2---52766117724.pdf
    • http://vejwun.cz/images/68840945856.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0595b8e719---nomofitizavoduxugefexofe.pdf
    • https://sportnazona.bg/f/uploads/files/26795409427.pdf
    • https://maintogelonline.info/contents//files/nopotukabukojedejidowefij.pdf
    • http://laweasy.kr/userfiles/file/tefaverare.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ff2ec03ba---9625503416.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/th86crdi1kgdeun5lta0qp1cud/panosesizexigafegijox.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/696703d8d35bffb00241ce3cc156b2ba/nimofi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=seeing+sparks+in+your+vision
    • 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_off000100ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 16792 bytes
font_01_sfnt_off000118bd.bin
eceb23005d672ded9c19d807a2a8acfb4634900b66b739d996719c527b91f08e
pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 16992 bytes
font_02_sfnt_off000144f7.bin
8ae6c837f12d6c559f2753f1e46b06bb12fa8bf31f316e22d165f4a9f53085eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x144F7 10732 bytes