Malicious PDF — malware analysis report

Static analysis result for SHA-256 24db903b4e21a5c6…

MALICIOUS

PDF

81.8 KB Created: 2021-07-02 09:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bdfbabf64df9e92de8f1006c7007374 SHA-1: d2fa996e8a282852757f97202d312ffb074e0543 SHA-256: 24db903b4e21a5c60830ed30033c4c7d92354006e5edf5bb4124ec21fc33513e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the overall structure indicate an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=exploding+kittens+unleashed+apk
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef92d0baac---wilufaxomurigesejedube.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0433f52d9cfd501dcb55442fb9b8e4cf/komaleritudikominijagisev.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160890d29dba41---21663061234.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723fac3af36---kadudebobuxupedaruravufe.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tnmbm3g14ddh5ml3rl5fr48um3/zijupemililagibot.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/2uhrm4ajjbvkktkihid959c392/xuzom.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2b350579835a394749974d62a53fec0b/zabonivugizibimilijekaja.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b318b8570f0---derirodirugoger.pdf
    • http://angelcabrera.com/FCKfiles/file/92237058835.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609472d576781---sidowiluzosuvu.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d20b00c9deb---25206765235.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/4nnrf3otoc0dvk34i4v61rnh46/vokuzifonuvuka.pdf
    • http://baigeleather.com/userfiles/file/39853025598.pdf
    • https://dietmoitangoc68.com/upload/files/daluxafijumusalurido.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/b56127eebf64be20f3eb9289c762dbf0/3014243782.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5455b4002---12697006234.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd22d32066---90588152233.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b69261f1ebe---zipanuxixipobe.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e1lgm7n56bosfeh4hp4br03t9b/35640267210.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0eebc0334---87012652108.pdf
    • http://huucodatlanh.com/userfiles/file/nexas.pdf
    • http://www.yoko-ono.be/images/userfiles/file/zoruviwun.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1F 16792 bytes
font_01_sfnt_off0000e636.bin
5c412053ce72ec3481b8fba7ecd18969b0f8ac3d0330db13bf84ae5fcb7e0293		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 10848 bytes
font_02_sfnt_off0000fef7.bin
c9bf50f82fcf794363e51f4acb2138fd1b59df892d0eec7a5337c5c8ffbc1055		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 1904 bytes
font_03_sfnt_off000107d7.bin
516ec2e0ed208a3f1d83ebdc0e8de62980e15a4aa77cda3e85fd6db827e8e34a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 18888 bytes

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