Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ba70179c34def2…

MALICIOUS

PDF

91.2 KB Created: 2021-07-31 08:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c5ec0bb71b106d0ced3535eba4047b5 SHA-1: 7fbaf874a1f1d8674dbdb3e2b7bc8f2a69bfc9b6 SHA-256: a2ba70179c34def25119cc2096efe616fda479735b6448a8ac4cd4a9e0f60170
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised websites, including those hosted on WordPress and other disposable domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://catamma.ru/uplcv?utm_term=regalo+double+sided+bed+rail+manual PDF link annotation
    • http://broadviewlibrary.org/uploaded_bvlib/file/95623544401.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/nijelosugotosotawibowe.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095949339ba0---pizupiwadoditaxadopise.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608820656a6de---77598874053.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/80810917239.pdfIn PDF document text
    • https://bio86.net/fichiers/zojanipimika.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe8285d99---pilofewixaxejunaxubumabo.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/gosojojumodawiguget.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607942e1d862c---88636094138.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/sitiwurel.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/bobejisu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160875c43de430---wurigutodexo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ba362470d---99865998551.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/27545407334.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/67806284312.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f18fa9666f---mipafemonokiperes.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d331407e5---25445684890.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/temapitija.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/1743570305.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/tomajufe.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/54153820157.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe9ce35824---vodunatedifevevesedig.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/degile.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qbp7mgoufaekurcak8pjeshku8/dosiped.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16071cea19387c---sanumixobuvetuxumug.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/51686496443.pdfIn PDF document text
    • 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_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 10780 bytes
SHA-256: a39b21820ea9bd664545ddeac9a11ba543c1633bc50b739c1e797124379b3d40
font_01_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 17448 bytes
SHA-256: 19bfa561036a8e5a87abcabafc5b2d24ca9379fffe99d30fad1b88ce2d351d9c
font_02_sfnt_off000146f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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