Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57429c743dd6db4…

MALICIOUS

PDF

102.8 KB Created: 2021-07-02 20:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e2d54c0256e707d459ffe3c331ee09af SHA-1: 92c8691808d73c4168e61eab11aefaa690b7f44d SHA-256: a57429c743dd6db4fa8f758f267e0fe8e440f45ef7ecd67d7cba8c104a81eeb5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous links pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, serving as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/abfeecbcc8b0552cbe6d2c38a5ebafa1/61727040807.pdf In PDF document text
    • http://alimentosldm.com/userfiles/file/rivizefebilumeg.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075492becbc6---sozejafikubirafunanifame.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1682a1e2ac---89779891372.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a3619cf31568c3a3571ae0b77acf52a/11779985167.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/fklmgrgkp7omoku3ei5hqdvb2l/wepegimuwidazuverevow.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083efbd64ad9---4270849026.pdfIn PDF document text
    • https://noddy.nu/images/file/24730982118.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/0v0fo72uphu03kdcpd06vbu7v2/61058812526.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/gojarisimujakekozoxitil.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/wuvamif.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/26119975497.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0c6bf3faf8647376371deaed9b81963f/weluvotadus.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/9nr9889b3ib24jd7g1q1el3f67/ponokezefurodomojo.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/61477062839.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3b388af45---jedifisubofurasik.pdfIn PDF document text
    • https://emprenderem.cl/files/sozutamabosebotoled.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/41414046561.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/9c04qavdcbuqq23jkkn6hcvouv/93507810191.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8eece3405---37768312673.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/48328840190.pdfIn PDF document text
    • https://bataretak.com/img/files/file/jebebutomevefoveje.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/77350642864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=indian+reservations+in+michiganPDF 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_off00012e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E57 17980 bytes
SHA-256: 881e00d90aba08fa3118f6d135b61fa348c9a163e976cf050cd758af6c2eb8f2
font_01_sfnt_off00015db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000175ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175CA 10788 bytes
SHA-256: a9b99e7ac6fe494109f8b5468d1f6cce4d4e02975cc707624fbea07cf8dae19a

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