Malicious PDF — malware analysis report

Static analysis result for SHA-256 8341bccd0544401c…

MALICIOUS

PDF

88.2 KB Created: 2021-06-28 19:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bf1e53eb7c2b9262e09408224ed3afd1 SHA-1: 0a77c1da19c3457b9288f2f6e783a99ae031cbf6 SHA-256: 8341bccd0544401cd9b72fcd816b42b66c48fa6ca7e2415768f39bd41aeaeda5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=girls+names+beginning+with+a PDF link annotation
    • https://bandotrading.com/uploads/file/mufet.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fd1ef92fa7dd7192b08000732e21dda5/60832340723.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c9e89206---vunanepi.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cb87a658965b5d152cd94a837257b2d9/fomevodixesaga.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/sk1a2288h4e6cv0dp9p2r47klg/bekimixonetemek.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/78066897963.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a651eb3fc9524d7908f1b741d51164e0/dafedux.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/vimumu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c724f0246d---rameresojugudupu.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/54725652612.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/vewiduvireferof.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9b365e6602969ec2ed2648e7457fb6ef/sanokuguk.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/34931381259.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ccc4to2uhqcnjhs281i4tpjunb/labupuletam.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4c29ba7e7---gebutobosidodidubixiri.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/11886392126.pdfIn PDF document text
    • https://tangentemag.com/img/file/jitaluloduvukape.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/62232065080.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608216c9de432---mejikorokezerutixap.pdfIn PDF document text
    • https://t2sc.me/userfiles/57252203696.pdfIn PDF document text
    • http://hostingalani.com/calisma2/files/uploads/kosubose.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce6fe9add---99222912180.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/dufelezukakapudoserake.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8d52f7f4---36694250946.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_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 10700 bytes
SHA-256: aac21bf03e45a2582a2f881d1482ed187b110723ca76af7bca1e5830a05603b7
font_01_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 17556 bytes
SHA-256: bb4d865d073472d2f6cc10390af9fde67143bca8e3f4504102efe379a4a5ec81
font_02_sfnt_off00013bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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