Malicious PDF — malware analysis report

Static analysis result for SHA-256 05517e5cc2d1657b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 17:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9059d2ffb80fef099c0f0b1750079b9c SHA-1: c5889ccf68382959c0aece2d257f8c7be31c6158 SHA-256: 05517e5cc2d1657bfdb26aa6613894ceca0495609a7bf9bbbbd65895a6c9e984
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3e507782949121a8262e504937e1eb06/1056511202.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ca49feb2eb05f9349b919e9f13cc189c/zatufobujakeninubibuwaga.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/q3qbtd1460f11tekivr0i7tj64/88148344871.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fdc5c5ff2---sulepirenub.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/27338888642.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/fofesegakotebipuwoxuxa.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/vegagotogalitomefojurat.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/lutajadiwojak.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090537dceb00---82645306333.pdfIn PDF document text
    • http://newo.ru/files/files/63161859821.pdfIn PDF document text
    • https://ienter.bg/files/wituludoditaxosar.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/vupokijuvarutoperulal.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/98990365165.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/pedirawosusirumowimuzol.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/bofesajuguvedesinosovag.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/58204999663.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kexigop.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/97045827977.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/37227137878.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0cdd499dfacb1295f865da002606ac88/jitorobiwes.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ff1456159db---fofit.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/1a2fea28f9cf3e7d16a1ba0ee1eb618d/98138207360.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/25c5d547734b54a58081f84989c3191c/60224454760.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/lujolorubiveluruxarituro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=frequency+of+a+tally+chartPDF 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_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 10512 bytes
SHA-256: 9b0fa911cfa3aa731591305e68385d547cff203eebfa8c99fb0c1393b3d405b2
font_01_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 18020 bytes
SHA-256: adaa529651b8dcab1af6d37e24045759fa05f39b4a2187f68940d539e8d19b91
font_02_sfnt_off000125da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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