Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4936bde7ff43cd…

MALICIOUS

PDF

90.3 KB Created: 2021-07-22 19:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a79bc5a77f1ad83d0f121923ce1fca2 SHA-1: eb698275194d8ea9c96fcf000cf6cbbb11d20cdd SHA-256: 1f4936bde7ff43cdfd1bc7b09560fb10cd0020b8a004ef468b06c4b8db5a3d01
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076d668bf9f9---33029256822.pdf In PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/15dd6142f943f4324c3396329f4c2693/kirerujuxirerusuk.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c769f7daf92b9cdcb91a7e0133ca632c/49769380369.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a330819e76---69017448435.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/38c067139c9ab386a03987d78bc74e03/jibowebepukulifojomu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075c25f9f101---kawijazezubufatazaxep.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/0b7922e7a5c44ec109a702f44f95020a/62512378200.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/labiza.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/6pns93l9hhjurle7eiu8sb1si2/3221700584.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/deef17d669f5f357bbe249acd5c697fc/nugeteropiwowas.pdfIn PDF document text
    • http://brlairport.com/images/file/jujega.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab84b54cb20---lerelos.pdfIn PDF document text
    • http://becucci.it/userfiles/files/41945137077.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/12739851070.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/babiri.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/lisamewavubetopi.pdfIn PDF document text
    • http://m2m2design.com/userfiles/19783057863.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28943a36a6---68020926447.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160892fc30b2d0---vapiwul.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/6ssvsgkq78qekjdnj3euu059s2/najinobaveda.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/mojisibibuxobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=learning+to+program+with+alice+3rd+edition+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_off0000fb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 11116 bytes
SHA-256: a9e255c1631706d9f71c5b6008f6a82f9b01fc810048d6eb71eba4a37e54179c
font_01_sfnt_off000114a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A7 17356 bytes
SHA-256: e4810461e059aff99be78a8182f088121cafa139cc0527efc9a23c7a48ada23b
font_02_sfnt_off000141c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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