Malicious PDF — malware analysis report

Static analysis result for SHA-256 f928684f737d64bf…

MALICIOUS

PDF

84.5 KB Created: 2021-07-21 02:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4f7aca6fbd557ce05f5aba8927385ff SHA-1: 1639f3a404aaba436da753a5d5530ff6b3305d4f SHA-256: f928684f737d64bf626cf46aba06ee5af60ca47cdf4f4bfc67880a8c7829daf7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to lure users to external malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://paglialonga.it/userfiles/files/17841190139.pdf In PDF document text
    • http://sdds.be/userfiles/file/29668928133.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lkdsss0o27jaljqbdok6o24rd6/bokigizaxodilajag.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/97941530862.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c947613cf01---fisidabubotewuxinu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079888811b56---veditarus.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/4t836utffigjdtu07dsgp95h90/85841657152.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/21c97bf70cac38ac7019c209b48ea3f9/juxaf.pdfIn PDF document text
    • http://technocom.pl/editor/file/bozadewukemufabutoregolu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c730e95d3ea---40853521408.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160994056a430a---pobutojopixovunob.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f90296e0---57642097269.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/12870632793.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607be4d800d32---sabeziwobazusitinopo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7a807008fbf919eb17c568523c10545c/zotuziba.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/99154037407.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607597984b7bc---87341179058.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/63509427736.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/76a3560d110167635afffb0a6132b15d/xumomijejexipuxu.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/wuzezobatelo.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/pawalikuzajobege.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/kawomodatozaz.pdfIn PDF document text
    • http://webbuilders.com/files/file/52891908477.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/mfk8vdvvl9er0d5c6ai08bogef/64905706858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=penis+head+inflamedPDF 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_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 16336 bytes
SHA-256: fab5e10209c823cca52c7b2f94b8aa6be63444055629b1d1856243a0215da635
font_02_sfnt_off00012e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E34 10300 bytes
SHA-256: fbc29ae85ce86bffcab51fba367318b0ca8702410b0cf9ad3a80fca3975e40cc

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