Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86289f99c571e89…

MALICIOUS

PDF

77.9 KB Created: 2021-09-12 21:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 14e02fe9a9b1357be714bcbe3b103bb3 SHA-1: c354396b8e91ac16d0e3c5537609f28f13abb5d9 SHA-256: a86289f99c571e896b52b4b28f544b5231007ef6aa58294bbb5ac1116e42994b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agnieszkapawlik.com/userfiles/file/kikuvifebomivuwerugeb.pdf In PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/14770144393.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/sixerifuduvezisodojoni.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109030310241557.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/gezadosawiwimefomuvegenad.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/piwozubulefa.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/32300196641.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/65dfed4e52dfd391a5aeb3501fa8ae52/85083489895.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613683512d6e8---xazekefoterogofuniz.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138abde82d4b---83623147798.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/mabevinawajisesagi.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/50379431151.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/75262937550.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/80869960610.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9c7845ca1b705443809ac07854551d13/jotegedilusopazafob.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/5093956943.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210910_200206.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/xurip.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/87067920499.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9bd67902e---dorixu.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/zajejokuxenetepitelo.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/83294067348.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/32066433357.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/38996892421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=new+headway+pre+intermediate+4th+edition+student+book+pdf+downloadPDF 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_off0000c147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 20180 bytes
SHA-256: d0e1c2c44863b2983950f912864a4b0ebbab8be38eb0a4083540e73e2bb4cb24
font_02_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 11348 bytes
SHA-256: ccdeaa50b7278d92bb27ab7e90604313dd68a6bf44d15bc89e94b0725ec49d9d

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