Malicious PDF — malware analysis report

Static analysis result for SHA-256 4583401cb84f625d…

MALICIOUS

PDF

107.7 KB Created: 2021-06-27 10:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4b81ec0e35ec755ee660c9972f8ac5a7 SHA-1: 9bec227594352b205b2826d2e9bfc4407b2c8710 SHA-256: 4583401cb84f625d164977f7902019ccc196b63ba7e2835c0a39ff2ae02676a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://allytemp.ru/uplcv?utm_term=mandatory+minimum+requirements+for+security+related+training+and+instruction+for+all+seafarers PDF link annotation
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/2fb87e042d6abb2f6185af4951820ff0/wunoweme.pdfIn PDF document text
    • http://efrex.cz/files/file/72839451288.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797e831ab3b---kelevugunapexemakatolon.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/71188152326.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/suwadesavavomugigiwix.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/fodokubixufilenew.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092deb67d8c1---wagunidonoseto.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/69322126275.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/57283428793.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a04161229ad---pebus.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/87251364785.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/54fd3309637ae1c81127b98beaa5d075/rizexufogeputawel.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f459b1297ca398b0f13929d884972da4/sikefavibexibuxukeze.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beed7c31deb---terizidek.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/4ad360aeb2c5b0fa7f6e616e618970f1/67718363370.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e372dc8e56c401716be2b12e4c910e3d/xisemagifudivez.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b8756b32e21865352173ed958fdf6b7c/bujegofazusiguvidew.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/23067383276.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb67ceecd---37244004708.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/12cb65b37d565416fdb1210b5ced4d7d/bikisawajafejum.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078763f769fc---94367019936.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf725e73e8---10174572788.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb05dba9c3---venigezujofufa.pdfIn PDF document text
    • 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_off00014088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001589a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589A 17744 bytes
SHA-256: 767cf9a4945f774f0639686afc7a12ab3b2353a63e6267eefd3214237c5e81b9
font_02_sfnt_off000186c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186C5 11172 bytes
SHA-256: 7e11624d2c4b1b0cc148fe2bbbb7332af80b9666fcc9908386d2c1f98e46e7c4

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