Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ac8c75b19458be…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 23:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5aa700ad8d5e3b934d64207c3d1bb2a2 SHA-1: 397f5bb648b427ec66f207560d077b825afb8a9b SHA-256: 83ac8c75b19458be4c01fd240d4f9f4139c4f1e6102a73618b725eef575899d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of creating link farms for SEO manipulation or to host malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b3c959f53---fezuwoforijusaj.pdf In PDF document text
    • http://ogbchurch.com/clients/880797/File/rurulajawumijelutirisud.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/jatuwek.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0405ccd4f---96858320454.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/326p1gipoq2mjfqav28gmcf9qd/wekafunekubepuminojovo.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/5d38809efd4a828155ee37cb317403fa/berumiras.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/kidumupixifegorivireg.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e00a4d8c11---gemefugodijofam.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/zarebajitif.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/xugimitu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e22fce642ff---66314970717.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b282b318b51---soputopimuwajubefupibeg.pdfIn PDF document text
    • http://geraldinekilkelly.ie/87267573688.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/moxaxi.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/70586676648.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/90690944169.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/14349262469.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/649991a67a959aa1b4d811a125f729bc/90177360696.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/kidageredivuzupojoxuwug.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/70615089120.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/72f8c8227e5a12e43e99eecdf6bc2a6f/nefuzidofevidivi.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/acb30263f2469d7227b2eb05c03be640/tinoxa.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/vujaxetezuresidarikij.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///50396008917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=arrowhead+provincial+park+map+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_off0000c14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 10844 bytes
SHA-256: 6694cc6ea26d95fd86f8252ac47430a33420d6083ac892056209337006f15cf2
font_02_sfnt_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 16984 bytes
SHA-256: 1cd825f35530d4512cf0bee6f6ea5f2befb6a2d2c63e7954e313451c52750657