Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc3102c1f1acd98…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 08:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8593931c6daf7b7b62fdd96181dd383e SHA-1: bc9399031e0fa4974b9e3538057f47042e9aa213 SHA-256: 5bc3102c1f1acd98b8ccc55b2161ffd59549e58507ff93ce021e1e45dfb23623
164 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate the PDF acts as a link farm, directing users to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eko-briketes.lv/userfiles/files/pixizuje.pdf In PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142719e443ad---12954013065.pdfIn PDF document text
    • https://upaspor.com/resimler/files/wotidero.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/notizulakipomogekuzirel.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/66966511212.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/wurajow.pdfIn PDF document text
    • http://rts-3.ru/upload/files/31406900668.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/83680950580.pdfIn PDF document text
    • http://trubaopt.ru/content/file/68010422065.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/40129861413.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161352fb809b40---67495811712.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/57122363599.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/19642343891.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/gozolagor.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/77665388604.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/38390171452.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/xivijapagugogepas.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/62603759226.pdfIn PDF document text
    • https://quizai.com/uploads/files/vakuguwim.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ac48b7f1---59742531465.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/kosar.pdfIn PDF document text
    • https://laps.pl/userfiles/file/483594945.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/namotonavito.pdfIn PDF document text
    • http://poliinc.com/upload/files/vapisogitoparixijaweripiv.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/28369470481.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b57bb9c0a70cfa0c31cb1ad0de1bdd60/fuwow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=avg+mobile+security+for+androidPDF 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_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 18088 bytes
SHA-256: 8cbf3fb36fcafb61da5491d5c75de65a6825991ed1af025d1c6b951ba5caef2a
font_01_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 11220 bytes
SHA-256: 0a982a44df069b1d471bddf893ddfa1201379b514e3484e52cbcb363bd66a6d7

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