Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80f79fee680578c…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 08:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e276b0ef4cda908e601f7f170a0193f SHA-1: 83fc76e5068a1e009c368b97a7b0d2044157ce4e SHA-256: f80f79fee680578c67061c82d13e7e4c2cc909b7fffd6d17b73e3785ae4e1cb4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of multiple links to potentially compromised CMS uploads suggests an attempt to lure users into downloading further malware or engaging in phishing activities.

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 https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/714sb2vtglfn9a493ji3tjthpm/18191908781.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e48bac714---nizimux.pdfIn PDF document text
    • https://magerp.org/upload/files/24434876200.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/pobuvotudamuxeg.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/237927018fd83d764abb99e9f9b249dc/19204912320.pdfIn PDF document text
    • http://cordovajewelry.com/images/file/sixiwapajijinibole.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/hv4o8nsi3lgrm9uiqd1rt2r5n0/57071910398.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d61344d2d2aabc91f472da3bc0144a34/zopiwenapi.pdfIn PDF document text
    • https://123natura.com/stockages/files/pogigi.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6ccc2cd93a342d0026d426a192801de4/45186064971.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/eb1efadfe451af9012e01bc174505085/27205816722.pdfIn PDF document text
    • http://dges.in/userfiles/file/59059580813.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/93169458814.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/xilolokikiz.pdfIn PDF document text
    • http://huntland.hu/upload/file/pivoregugago.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/60318936240.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608692930408a---74797896729.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/44718634109.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/44332186216.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608418647a736---51043952359.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/duzalenorok.pdfIn PDF document text
    • http://www.radiooro.com.mx/media/images/uploads/files/pulozezapizurewibo.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/81911920017.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/7013316545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=osmolality+low+blood+testPDF 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_off0000c95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 16992 bytes
SHA-256: f907946dd9978c3827dfc023e81440f561476522bccbc885fc8a246c130dc96f
font_02_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 10568 bytes
SHA-256: cf56e1aadade08efbc097cd5a434609a886f5678ae3c7f524a75f6d6ba908800

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