Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0bb7e961e19069…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 13:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b578f30165839c5292ac643139c9eb7a SHA-1: 7a0badc3f52807554c89a9fd5290195c910fe48f SHA-256: ad0bb7e961e19069e002e916db6f49310f9c32524a16a2e7e824937d2bc99d2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=smart+led+40+inch+price+in+pakistan PDF link annotation
    • https://millersexpress.com/userfiles/file/rorugawuzakaje.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/4609676577.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/56183663155.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/kurasebolaziliginojukuve.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/69b9281a6f2acc82d784ab0a14ddcf79/83237133917.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/82270569601.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/fuzulirozinilelosodar.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/75175961924.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/51611870071.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/98378064945.pdfIn PDF document text
    • https://recrut.com/files/files/25948115221.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/63e3d657cc9c3b1dc733d3476c634acf/kiwufulowikonini.pdfIn PDF document text
    • https://renewone.de/files/sugoramasejivefepu.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/60211664196.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136a22651598---21123473654.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/foromu.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/87625212604.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/tumotokakip.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/moniwemiduzujonokofokow.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/34477223065.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea676dd67e---10000408534.pdfIn PDF document text
    • http://teakdeck.pl/files/file/61520239843.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/lemomerifatiluvasum.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_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 17892 bytes
SHA-256: 255e5f193b709c52c271de9504c21dbd2e611b6a7e5f6797c5418a5b4f935e2c
font_02_sfnt_off0001269b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269B 11024 bytes
SHA-256: a3102d7f0e2118a21f968b8f3a4584b6528461872fed3b6b647c1b27bbd7d6c9