Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8a5136b08f1550…

MALICIOUS

PDF

148.3 KB Created: 2021-09-12 14:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1819b3c855522052e683bd471773e593 SHA-1: 1dcae0e9b30db69baa30004ebc981ab9ede8704b SHA-256: 3d8a5136b08f15503d96897fa01daa39e8dfebd4feac678bf3f9491a14ae5dea
156 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 disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and extensive URL list are sufficient to infer a malicious link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://smidgel.ru/uplcv?utm_term=to+kill+a+mockingbird+book+pdf PDF link annotation
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210908_730604BF343BEDFC.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/dofavipatavu.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/rerikulefowilelopabotux.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/zabudakawujadaz.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/68621363318.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/13825689961354bd9b3232.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134432b22832---tuboniwabawis.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/fakaju.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/sosujodadusaworixagage.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/xinozufuxowijubim.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/85517933240.pdfIn PDF document text
    • http://ndt-ultratech.com/files/41004890523.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/gupirijor.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/83203471102.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/mizekepulalobosama.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/14907952624.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9b4b99e85d875d178c2a85a3bec8d57e/82707094302.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/poluj.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219732729966.pdfIn PDF document text
    • https://olterus.org/contents/files/18219799790.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161336567e81c3---25460831695.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/bumobafejovesopovabami.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/sepukubibarikiperibe.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/7630492733.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/12339711528.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nixenuralafe.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_off0001dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFF1 19188 bytes
SHA-256: 9dd374c572edcc5f001b4ff3e2adc0a9bdbd0673b0617e66577e59ba0a4fc74d
font_01_sfnt_off00021256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A6D 10760 bytes
SHA-256: 0933e6c053e10542b051830c0bb1bcd07b5a7e209d25c015b3b94c5983ccaa39

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