Malicious PDF — malware analysis report

Static analysis result for SHA-256 784b2b58de79b0c7…

MALICIOUS

PDF

90.7 KB Created: 2021-07-18 21:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a60c4d39585c2c975a1a0e01f6610a5 SHA-1: 7d8582056c8e46f2f4e37aca6df039ca7c2279a4 SHA-256: 784b2b58de79b0c74543a8fb7bcd5f863e203653b96bb09039ad039fd896b17d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

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 https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/fdb62a4566f3186c49211dc08519a021/guniximerizofuwetatugi.pdf In PDF document text
    • http://surmounttravel.com/userfiles/files/83245195455.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a6a247605b0b5f24c43af56dcd3f69cc/penopen.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/dotudizuposafajilureru.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/vobuw.pdfIn PDF document text
    • https://soechi.net/userfiles/file/gukalopiruzef.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/54969d4931a3fe7b4a519321eda1fda1/9490397069.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/matalewujan.pdfIn PDF document text
    • http://186086.com/upload/files/paxur.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/webijosanowifusijimune.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08bb0103d611c2547c6e9b0a2a952d08/50445330726.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/38e23b3fb690d810b88ce371f685a3a0/zovuvupenelasuxoto.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/zegomufasefigunijavu.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/vojutirimebonadiw.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/nrv5evv0blrhopigmklgcsjl17/93111730752.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/9595151267.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/u2pl846dbrir1qmoffdqmj3lgu/55602753681.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/nugifaliloforex.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/gufudasalivelo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca316b1450---72115557169.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/bfd23fc42045dd305ea9b3ff813a8522/kijizoditokejujeges.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/cmf2m43959f08ctmgjd68k468v/gazudakifuwukavapuwiditom.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772b5d92403---dirineregefabisojidaxaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=conversation+verb+to+bePDF 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_off00010243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 10292 bytes
SHA-256: a910ef7141a9963e30dac2461f604121cd956f4c500e98ecbd0e3388f5e0f7c2
font_01_sfnt_off000119ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 16432 bytes
SHA-256: cc360f468d9bad0a2b8599c9015c5e2efee5a3f079321e00f804ff8f7b77adc6
font_02_sfnt_off000143fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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