Malicious PDF — malware analysis report

Static analysis result for SHA-256 38aade0a6ddbb08b…

MALICIOUS

PDF

100.7 KB Created: 2021-09-02 06:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05a097a2b0edcbea00f04bdbd1e11e34 SHA-1: 342725179100f2b796c8ef02a368bdbb45be0666 SHA-256: 38aade0a6ddbb08b30ea03ea13b9482bc5454a46f6c52c11649069ad73550f21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF file detected as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/58ogi59e9gatid86messan0215/zajinovazik.pdf In PDF document text
    • https://projetounificado.com/uploads/files/99635491999.pdfIn PDF document text
    • https://airshow-bg.com/file/nobawogulawadufedetepupa.pdfIn PDF document text
    • http://ausafe.net/images/art/files/bedawokumotipepepe.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c4810b45e---xekaluduzawesijazolef.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/60053468111.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/26125849844.pdfIn PDF document text
    • http://falerisztika.hu/tmp/kakubosaxejadetad.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/nuvarizedefotasusavidu.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/32497521072.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/503671411cceb576039405a8754ee5d4/dabixaluwoniropipujazeti.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/16802239586.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/33677525469.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/774c5ccc45080d7714b10eb5ced55310/fevatevugedukubuvame.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/68ed4c85ccfd7ff377fbff8ab1bc2291/nemipivifilupujatesazepat.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/59146359909.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/69058736579.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/13427596136.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f013b111---ramugozezuwiniw.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d262501e---22607996772.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/sumuxosifapomuj.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/cis9tnglcan5k6sk2quijsu9n0/vitarigepivisem.pdfIn PDF document text
    • http://phsbulldogs1966.com/clients/8/87/87911cb64b10f66d93d15f7b6e22d365/File/gewikegexemagerabolen.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/libena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mcmurry+solution+manual+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_off00012206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 10856 bytes
SHA-256: 2b073009ae6112daad09c23cd9fa4c4a0eac479e47b3daea906c6a574b37dd40
font_01_sfnt_off00013b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B18 19092 bytes
SHA-256: 220bf7eb6235d73efe8824cd2bf40901f2ec093e032531a5b37ea7f59fe233d4
font_02_sfnt_off00016cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1