Malicious PDF — malware analysis report

Static analysis result for SHA-256 44743deab860e03d…

MALICIOUS

PDF

81.9 KB Created: 2021-08-10 07:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0afdaa2cc06bd9d44e8b28244109164e SHA-1: e98bff51f6478c2a2ce9a6b56c2714e9f1fbaad1 SHA-256: 44743deab860e03de3476bfe36e56046f5067a13a09be74ce282f9ca98b0f470
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hattingtoemrerogsnedker.dk/userfiles/file/zubivagodazigetimubiwesu.pdf In PDF document text
    • http://bielwod.com/userfiles/file/24834529875.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/10190351720.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/sunumakoxasugevamal.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/getimosikafi.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/39ace3c380f0027717ddbec8cd30692b/bejopeziwamuxobos.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/sujusegesawevivasiduret.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/95076062287.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/fosunogan.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/komodexuvanojoji.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092c91436362---papalavagil.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160835090c9587---30319249743.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e4c26bffb---fomiribigolivuxibijabe.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b90ae75a4f0548ae70aca5467919db57/23333910025.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/86413786275.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/91764712335.pdfIn PDF document text
    • http://rilta.net/userfiles/files/parofilu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/172cg21c97o6827qvfnor1odp7/rurusijudeja.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bf890ef1cd2---lekivililuxasogukadoxuki.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/2be32ba78c58830fa97ad81779221325/31137237401.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df7d3d41585---vibaropodetuximalaji.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a415f9b0b4d---48183434549.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/dolape.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6bfd49b4f42d0c0383c12813151d1e75/83909455844.pdfIn PDF document text
    • http://klhl.com/userfiles/file/88010103928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=assistir+eu+os+declaro+marido+e+larryPDF 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_off0000d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD867 19040 bytes
SHA-256: 8bfe4e32ef0bb472ccf6238da77ec934d0b0b37f2bfba132c4481a69e8561824
font_01_sfnt_off00010773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10773 10624 bytes
SHA-256: 36229e155f08c59c7911c0c496e928d87539f3413c7e11bc3e44a593ca24ee86
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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