Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf1ef1f0f43bd26…

MALICIOUS

PDF

87.4 KB Created: 2021-09-10 21:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 092be788ba2bb2f76b2cb9bb5532dea7 SHA-1: 080b25ab411f21d9f2d8702d0542e57cc8bcacce SHA-256: dcf1ef1f0f43bd26b988a14c0fd16a116ec79c9b8c535a53c3cd31dc05cbc0fa
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://chineseclothingonline.com/File/18400654581.pdf In PDF document text
    • https://bunianco.com/other_files/File/tunupaxovuju.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/wuvojawemajuduxolifevazig.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/nupokezosaneboxawi.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/34122578363.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/449b0bbac06e055c415ebbd7650acc26/38211536785.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/jazitetinisumabezixodi.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/doteved.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210901065813118.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/20580438247.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/7ac4a6d23a888ff7a901dc40ca51c815/bomuwolesezatopawalewuf.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/pebekesodaxezixikova.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/25290845738.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/49736945962.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/55768851563.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/48426823669.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/domuta.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/powikopim.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/jokemunobawobabix.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/wosetujevozenalilo.pdfIn PDF document text
    • https://tepihtrava.rs/files/96811822567.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210906011236263697me97y.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/be96492d7b3e39d3bcdc2aff5d5830ba/95239325677.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/fapofifexegigo.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/29467417071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=historical+games+androidPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/76993873463.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_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 17256 bytes
SHA-256: 42681903e054df1dd943b3088e11b70350c4ee0a8441337cebcc60383f794c11
font_01_sfnt_off00011f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3B 10704 bytes
SHA-256: 3b4154ab0725103584280bbb5f461845bf33273b23f1c601df9164deceff27fe
font_02_sfnt_off00013790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1