Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cebcfaeaf28411…

MALICIOUS

PDF

98.1 KB Created: 2021-07-15 15:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7f11c2c9f3b143f28311fd87af5c5adf SHA-1: 168838ac719ad73d67e2dadbcb181a3fd1469d92 SHA-256: 45cebcfaeaf284110f0a0e5fa0d788ecd531c2fbca1b653289ae9fd1856eab76
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://vansuloi.com/uploads/userfiles/file/lofusalixurax.pdf In PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1095e61b5a0a09e7ce0d24be50393f4c/tuzukorugilenavigi.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e4c0bc9eeb1f763620fa6c07271d8dba/wibeb.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/d31df5ca259e257f27f632a3116bc801/goteraxisewuxisuveranu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c780e59e733---kijefekomorinoxib.pdfIn PDF document text
    • http://4bx.pl/public/file/63306282398.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9e5d6eb91---520526.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d7cab0ddb---ruwofemobozonevuto.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/4690037903.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/i3hcpcbal9o546vbqsngskda5b/bekodixibo.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/54842599039.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089641f782ec---tikutatiturepakodu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eac014c9bb---23306906851.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/caf47eda152a48f71b0c0222b250ce6c/46464314459.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076e83347878---63046765609.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/82455633822.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/nipenep.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609a92803eccc---62082733814.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/59652574094.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/15573284191.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4061e76ce---votagalefuto.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/gekewog.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0658aff33---14707019686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=central+line+insertion+complicationsPDF 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_off00011c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 17536 bytes
SHA-256: 0ee5c315bfba33365a6a8420711272879c260c707e09a4592f42d08371f7d5fd
font_01_sfnt_off00014abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABB 10564 bytes
SHA-256: 3f85ce7fd4c9db16dc4f0ff60c8c19b9cd11407f162a6c8fc1d426f069fc80fd
font_02_sfnt_off000162d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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