Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c25d355d8e904ec…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 06:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 707156c97719ba88f4aed10216136692 SHA-1: 80af7da00e74b4160310e3a652d25afb9025e5a9 SHA-256: 0c25d355d8e904ec4bb8294c4362c726e28710554cd1471af6b85294b528c74d
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to lure users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'download button' heuristic further supports a deceptive user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://oniceh.ru/uplcv?utm_term=dil+bechara+full+movie+english+subtitles PDF link annotation
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/sanowafamo.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/kojesokubitesagez.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210917140546.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/66111042368.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2d2aa9ef6dca3fad2ad6ceece95cab48/lonamililagij.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/94717045805.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448f791540e---wijasakamure.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/kiworomuzifit.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/95812558324.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/13790787867.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/divajiwatagolevire.pdfIn PDF document text
    • http://futboltotal.net/images/files/kovufarusamofawuxuziligid.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/88485797298.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/55846892589.pdfIn PDF document text
    • http://homeopathyhk.com/files/vigiginiledap.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/25469590137.pdfIn PDF document text
    • http://husplaza.hu/editor_up/32721293277.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/fipufate.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/q893ko23mdvrk0o4m5jric11h7/13463881793.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/gijusivilulilabowaru.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/83040390170.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/wafir.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_off0000c76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 19476 bytes
SHA-256: 6fb663ef9b7729d019911d06c0eabcede7fa76480d6ac035ae2ea1c698f1dbf4
font_02_sfnt_off000111e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 11092 bytes
SHA-256: 7971834f7d4881d2e8d37e4853aac35ccf64fa5731e90222956d044aac0f09b6