Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9a15639bcf1508…

MALICIOUS

PDF

73.3 KB Created: 2021-08-12 16:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45bc7e18a917bf2585b86fd569be66f0 SHA-1: 08fd7f02466e346b10ff43b94c4607d84694d8ac SHA-256: fd9a15639bcf1508d759ad0fdc6f0b91198b71b8b9ce3b0e08bef5b76c016584
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to domains identified as compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm a link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://zpb-maciejewski.pl/upload/fck/file/wogopu.pdf In PDF document text
    • https://hotnews.md/upload/userfiles/files/fogupakaw.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/20677980613.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/siniwalutedekagalikosowur.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5usdd50ee9m2f47t83ar5stibn/kaxowezeriked.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/puwofufizepesin.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/88526361882.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/14099815577.pdfIn PDF document text
    • http://renknh.com/ckupload/files/25187217202.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/148562ce9bdfcac5520a4c1c5c11ff2b/21368522818.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/nuloxatovafu.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf6b18e74a---61944795480.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/firarugitivukawajizowar.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/gajidosiropo.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/xekeletukubixib.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/setivewi.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e244e93bf02c32584daee6b86284409e/38451533670.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/30878753838.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/rujowogowafilazusalawida.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/16cfefe15f80d1377ac4d55f24573625/51987159251.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/25240044e257fe3c70fc499754444fee/31059515445.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/80655089281.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/f6jtul3lba6j6tk182bt6krbnq/80862831710.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/wifugimal.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087e5d9b65df---58115567891.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbfb41b96---35180885037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=corazon+de+nino+sheet+pdfPDF 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_off0000bd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 10640 bytes
SHA-256: c80256fbf39bccfe3da5f8721782b133a11c5d33d6892f275674fb0b57202fed
font_02_sfnt_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 16600 bytes
SHA-256: 9ae44a2ff2134d253fc8086d142a62595b7c7f685cc86e3326e9a921bcfa1e2d

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