Malicious PDF — malware analysis report

Static analysis result for SHA-256 1175bda90db153b1…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 08:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93010ba82741009d0e37e39c82e92682 SHA-1: 04a893d5e93fa0ecec2769c7fa0caa1568c4cb51 SHA-256: 1175bda90db153b16249505e25734bbf4ccaaf3b282f11268a92e4e56879ed16
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and disposable hosting, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive URL findings point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=fundamentals+of+physics+10th+edition+test+bank+pdf PDF link annotation
    • https://www.tunnel.de/files/uploaded/file/10798871188.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed76717ba6---vajanoxukolakotokipig.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/161264beda8c67---wolokenolujilifopebuneri.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/giwosepuwogolakunevog.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/fekemedovozexojuvonokiki.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080b2c7562ca---65211669460.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/notugefejumetomanuj.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd457f1f903---jofalunedadozasoke.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/67734838941.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/65062184668.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/7744858296.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210629012130.pdfIn PDF document text
    • https://norservis.info/files/files/80322331999.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612178a883790---14804171761.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/diwisafadumatiwowitogexav.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a0fdb8bc58bbda400830a79196bb01c5/bunudezu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16b6ea46d6---pizurogosofimepevuzizi.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/s70dc8ruv4sc1rvida95ptjk10/25571900351.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/60349008426.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/75cb6866bcc2ad1c061495f73b57fdfd/sorokasavuwafalumibux.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15100e7868---wajesumitolamolepexumaj.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/74eee0ecd06bb1e05497dbe091633676/zilipamumez.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_off0000c17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17B 17180 bytes
SHA-256: 49f5cce548c527e66ce7184ff042dfce83e117e53a0b7cc3886eae379455f918
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 11380 bytes
SHA-256: 72c58010025fb2a9cfb07500beffa5504f0341ff2c49f3718b3637c4b401fcaa

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