Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80da09f6ddaa5fa…

MALICIOUS

PDF

96.6 KB Created: 2021-09-06 04:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ea741a2cc39dadd9dbfdc8c4bbcee83 SHA-1: ecc4fd2a046cf800a5f6d1c939d9d3983806b611 SHA-256: b80da09f6ddaa5fa1f3a6cb5d71cfa757b6612c79238fd3a34e21d5abeeddc3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160eca4751da81---13409275943.pdf In PDF document text
    • https://invest.pl/userfiles/file/77087655418.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083174298459---31010600148.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/lanigogawa.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/vidovabuwekasogidukavok.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd0acbb3c---kakugixew.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0ec8405283070201d49a48506cf3e8ec/suzokatumasiwumo.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/50183219938.pdfIn PDF document text
    • https://citronel.com/userfiles/files/genenuvirutivorife.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/246893adae926623b68a4c57320c2f3e/gavawa.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/67454964385.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/9740396655.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/bepametijekupaxi.pdfIn PDF document text
    • http://robbes.nl/media/files/84648893516.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d50f15356---foziruwuredomekufolidoses.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c5b35dd5d---tosulagudekipuxelobikori.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/fupifep.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/tizonagaxusorasu.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/jobetanimedigakefumep.pdfIn PDF document text
    • https://whitesal.com/data/images/file/7896_20210524112514.pdfIn PDF document text
    • http://regcureguide.com/files/files/fifotazavoralom.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/9ecbd48cb48cfa745978e0d8394a0d47/64139009167.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/5ffcd1e159407db15f90784cd95d6e3f/venakavewikuva.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c22bcb6001d43f47eb38c18c55b2e41c/26015360996.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/50138104953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=agriculture+farming+books+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_off00011232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A49 11276 bytes
SHA-256: d55994f162530fb06512ee760ed0aa29ee00e88ac409f1a126fe44211cbf09ac
font_02_sfnt_off0001445f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445F 18784 bytes
SHA-256: 1c1777188809dfa79a38708fe8eda673211e0e881fd3753a8c63342c5a4ec654

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