Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ee2bb5991c14b5…

MALICIOUS

PDF

82.0 KB Created: 2021-08-20 11:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 2696f68462530ef5ea1c6097ac599dd2 SHA-1: 58fa1097408898ad2ebb1b6f1141885a2796f907 SHA-256: 53ee2bb5991c14b568b1076fe4807c4bc893b78f0d15680fe7a0c0849ba5068a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the heuristic firings suggest the primary function is to host and redirect to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c29e7148b---dipoturagufofuvu.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d1ccb57f57fd4de86ed873999358f94c/ragozuwerosisotowe.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/nedewemevug.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/96049948549.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/3198615226.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/vuzigixobo.pdfIn PDF document text
    • http://dgkno.cn/upload/85756570204.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d51f6076468bf31021bcceab7b8ab1da/rudujobolox.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/kofuladenagudakom.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/gadepateroxomenadanaxo.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/20812420144.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/62381151670.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/24588868837.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/gujidaviko.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608687cab9658---fixoviji.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/famatavawejerawum.pdfIn PDF document text
    • http://imi.vc/upload/files/rigopevitaxifogodurap.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/xalerej.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e082a68e---95370448146.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a43480b01da2486e6f0b6c9e59a1b1ae/60515634181.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/favulavi.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/28430499928.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/sucs00if91m268g2hpve2d3a64/15288717360.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079b1037f899---43990302901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+add+mods+to+tlauncherPDF link annotation
    • 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_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 10720 bytes
SHA-256: 28bffd54e7ea83f56ea8b1e378009f13208c5c89368f6bb9e19c9d57305692ec
font_01_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 16140 bytes
SHA-256: dfc061371f32907ad431998b1944356cfca830197bee0a3087d4702c5af3a331

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