Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f3413acf45d0ad…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 17:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: de736dc7994d59563df0d2d984891a6b SHA-1: deace324bc69fada03508559dfbffdd07881b781 SHA-256: 49f3413acf45d0adbe1174712357077f71af0e1267279bee4ef1af30955dfaf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This behavior is indicative of a link farm designed to distribute malicious content or phish for user credentials. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=access+point+names+are+not+available+for+this+user PDF link annotation
    • http://thegioimaychaybo.com/app/webroot/uploads/files/11461382623.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/nuvubomuzakefas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efea671488---tubagifepobevovej.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/34edeb624551cea102bbb1dda68bd281/66969695283.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/38136802159.pdfIn PDF document text
    • https://avenue102.com/uploads/file/81903654099.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/rakaxakijuvidabajokeka.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/labusulivorimipamij.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/69584791289.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/41913117902.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/579082508.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/bosukusinelabokute.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/30342536570.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/mazusatixeguzitas.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/5bc8be076532d88f280f27ca3616f611/24229475775.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/kixudenaginilijex.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/65063769202.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/88463893835.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/16269795863.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/e8r4m9kqsvf0ucfn5uj5230f00/fotodalikikojif.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/1279455043.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/didekowujowepu.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_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 17648 bytes
SHA-256: a258950e4ecf5e075355dff0fb25b51bf8656377298b428b0d7bc2e524700c02
font_02_sfnt_off000120e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E6 11032 bytes
SHA-256: c81d661ec66e9fca11be0ee31d4a18124de5ba4a53559d7996e1f6c33957ee9c