Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d97f1607c53bba7…

MALICIOUS

PDF

94.3 KB Created: 2021-07-17 05:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 78fffea81324a669f90d2e887df01f12 SHA-1: d457c56449338a4ecce341bafa80beeccd58fb8e SHA-256: 0d97f1607c53bba71722eb59623eac55f40f8fa9465e73b85f453c7373580c23
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used to distribute malware or conduct phishing attacks. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.allatpatikapecs.hu/images/file/28394616593.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874a87c80d4---42110861993.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/12bc13b08583dc7f3d546e103c609945/letalotu.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/2c3522db415b4f49be6d4c89f05c4af9/90893424154.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ed0fce4a14b191ffdfcc2172940866ef/xuziditimakenazodo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c99d46f28cf---21310286084.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/2100033670.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/lufuwe.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/xafuvewaz.pdfIn PDF document text
    • https://landbar.com/upload/files/zinazugalitimurilavedade.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/94317245104.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/86671922122.pdfIn PDF document text
    • http://soupworld.de/upload/file/lawetirijixika.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609448c895a42---fabavufubabudifaga.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/277bbffa8e07cc5a1a35ed71fdd68161/fapudowifakutewatatubowux.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/kub2ao46pt61ej67emglltcrad/88996227577.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b13308d9fc4063a6fd379d5dc7b319bf/16783644232.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091dfe48b276---78590751923.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/netojokevubipigukabe.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/fuwovomamabo.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/763d9884ee9e4b3a2621dd9920a8c106/butebajezoleteruriwa.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e86caf38b---tuzugatubenatofitow.pdfIn PDF document text
    • https://asi-filter.pl/files/file/38700845370.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/kugivaboji.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609478dd3e8cb---fejozowosoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=control+and+information+device+symbolsPDF 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_off00010b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001232f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 10988 bytes
SHA-256: ea1e08a7901b4bb72158cb43c12153099411aba9d74d029ab9c9bc7e0d63b973
font_02_sfnt_off00013cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC2 17876 bytes
SHA-256: aea60553a8d342860b8c042bd9fb0b98cba3cbe1e090bec4b387381c39239d3c

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