Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d50bb26b311823…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 23:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 510ce054e460916fc6e0e8cf85154d32 SHA-1: d9c39614ddbae3a860c87ee21e8692b0f768d1ec SHA-256: 44d50bb26b311823c45948ec57bb345135b9543bc550409807722dc41c15914a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The primary attack pattern involves directing users to potentially malicious content hosted on these external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://drafthe.ru/uplcv?utm_term=free+fire+new+game+2021 PDF link annotation
    • http://djpress.pl/Image/files/laziferugebedup.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/98935599321.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/navulegibux.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/52800755877.pdfIn PDF document text
    • https://blugarden.eu/file/totujokodegabadimefal.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2050cfea---tomusetojajiwizonuda.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/15963759388.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3f32b395---sewiluxujutigujik.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/wedig.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/wovavika.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/50937441797.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/pigulubuxenesufa.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132f71b6cf05---kosopifusebexolug.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/72651105423.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/puvosesa.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/kujigemidupamomekobugiz.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/31628696736.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gogatalazeg.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/95573456481.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/89088412985.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/joxipisaxosaj.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/20187233173.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/ripebeloto.pdfIn PDF document text
    • http://frchem.cn/upload/files/lunesivafadafa.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/fosuzoxit.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5d638767---nalesititimotorixigeteku.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_off0000b7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BA 10480 bytes
SHA-256: 1a0a0d1a01da32ac3edbc474566aab5bf69289afff7e213a60cfa08d81963aef
font_01_sfnt_off0000cfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA4 16932 bytes
SHA-256: 293d1774a08c1af1823c17bdf391cf7e3f0bedeb38c2be793fbbc71f807d459d
font_02_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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