Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1a1c47512b1a1c…

MALICIOUS

PDF

88.9 KB Created: 2021-08-09 04:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b918c132473d2bd7fd1a86d35c43fb01 SHA-1: 3b75949d5f97304e10b4756cf22ac898c2a5967f SHA-256: 1d1a1c47512b1a1c0a09aee830a6e17849150ee062209fd7726da017f92d4e5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links are structured as a link farm, suggesting an attempt to obscure malicious destinations or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • 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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b805e000e---57335621582.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610df10dde22a---59947577119.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/wuzaduvon.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093072a53861---repalokopalafitojopi.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/juwuzupinon.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1dce7069a273a5e7919322623bf92bae/40899915979.pdfIn PDF document text
    • https://tavio.ru/files/file/85532379573.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608535af49fc9---rarev.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/50616632064.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a204f34a752---40265576063.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a53768ee51d20bf24d47db605d89865/72144262289.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/60560391649.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609651dee8739---93898524373.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/89637804606.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/42738045305.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/mupoz.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09726458b---38274650293.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160af9b6421393---32185964521.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/kolarutorumox.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee2797f18---povuguwenaronedo.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/fowarakenibivirawipupo.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j1r61g7g50cr5c49ok5c6fk24q/pozenumifijijimejap.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/zitisetafuvamek.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/48992610939.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc545b463---36895587353.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/lekikexirivuwop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sports+head+tennis+unblocked+gamesPDF 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_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B94 17948 bytes
SHA-256: e9e5bef6521a9ed1c783ceb3a9dea5aea0bbf3e03ba6e3d1efd6c38a640f3ec3
font_02_sfnt_off00013b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1D 11368 bytes
SHA-256: 1eefc32490ff16bce2c9741cbe4549fefd1e4eea489a80e366d1e9d1c9b00fc5