Malicious PDF — malware analysis report

Static analysis result for SHA-256 6361a2eb84be6801…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 19:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3fad6135f28340d86daac7ed2e4fc098 SHA-1: c83aac38117526c32652087d6d69c3d772b9d0d2 SHA-256: 6361a2eb84be68014b73f99591f7695705f6ab0cbcbb3e4b02b1f8fabfe83fd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious PDFs. This suggests the file is part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/360ca856f14547c6c27e87c18eb7f859/73195708697.pdf In PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/23309140427.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/bd44b0a6a37ad307a81592094da01c0a/mabavimit.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/tisolixeparipo.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/33373260931.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021715225113952.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/gavawejipej.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc1860d823---31562224335.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/waferunomesikalumimas.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ebd05d342---guvefexuju.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/oa428pmv9auvm67kd4tqr9o7do/92311419801.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/3287202677.pdfIn PDF document text
    • http://kingnature.ru/files/files/84410614866.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210801194348_1knnrn.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc619eb3531---39123267374.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/60033485955.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/38530235428.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/xomupo.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/masilimifipumujomi.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/zixudububalevovera.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/23861528559.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080124cec9fc---55949394405.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/e947a307fd2d638b4659e2af4926b865/84387434612.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb027026438---jirawuvivozedomexeso.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/76920211111.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/kazebojanesela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dictionary+of+selected+collocations+pdfPDF 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_off0000c0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E8 10728 bytes
SHA-256: 1cead9db63df31c16764650d18835cc5a7e7055672fe81caa08d504dfa13d4be
font_01_sfnt_off0000d9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 19468 bytes
SHA-256: f8f0620be7eaabcc084832f73b6cbb5cc6ab68967cfa5639414bc5a3ede5c99a
font_02_sfnt_off00010c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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