Malicious PDF — malware analysis report

Static analysis result for SHA-256 4999bbdc1d48a135…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 00:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dcc5328d962a2828abdd0aced5b7d0d2 SHA-1: d53547b7af9eb117d01f38d973b5fa924ff2f3ba SHA-256: 4999bbdc1d48a135cd21f532bddc46c652a31f0634375b6496b1026d40cd5b3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing pages. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=formasi+cpns+kemendikbud+pdf PDF link annotation
    • http://netisiletisim.com/guvennet/resimlerfiles/kavapen.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd8bd06fd---zexelajamomenawejosezidik.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/03ur05j5ljdh43u8dgiki8t6gl/26650264988.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16083bebb324b9---48337830321.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/duburipigotud.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/73328374855.pdfIn PDF document text
    • http://foodchemsino.com/d/files/8668021928.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/wuzelepuvu.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/lowaduzerumixe.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/68033495712.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8721405724.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/gogopujo.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e950a6753---taxalefusajibatotug.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/44001994873.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607733852e5d3---pololomepizegukamebupuvuj.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985ab5009ff---79416802336.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16118477523a1e---guluxizisos.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/gafizutolomubi.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/peririzagagexaxisakexose.pdfIn PDF document text
    • http://dentherapia.hu/files/file/ligegilatutaxibelu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf647f2f19---rojoniki.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/tafudone.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_off0000cd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD33 10948 bytes
SHA-256: 4c796adae375525c8b272d04243a1bf08865ad11a45f89111c4717abd6cdbed4
font_01_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 16648 bytes
SHA-256: bef9926e95cbb72b1f98f6e36dc8c4d82a1f7e16bb8d4f47c49c0b7367aa4027
font_02_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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