Malicious PDF — malware analysis report

Static analysis result for SHA-256 085e7bcabd528586…

MALICIOUS

PDF

68.4 KB Created: 2021-09-07 13:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ff49078a9ce06965bda991271627d92 SHA-1: 4206b941451b9d5c5149f7cceb91c37bea86f2c3 SHA-256: 085e7bcabd52858633b5bb28af1ec1e6a01fed4e409c002ff9ff30d14bf2389c
184 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and is structured as a link farm, with numerous URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are designed to lure users into downloading further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://manixcnc.com/ckupload/files/lafamafibonudu.pdf In PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/negexowazilofik.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/rojafavedudi.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/28fe28b4d3cac32ae32991b7bc738650/95830664251.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/nadudonubogimugiduvavu.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/20800714040.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/kewetesif.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/79508954023.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/zikodireruxexutavifi.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/c1543fb8a4c34983d41304c9d596b709/tamof.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/48191734473.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/linofimuzodeto.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609827c795909---87214583607.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/16003294069.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/2170792922.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/zelaremewobiw.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3b341a7c1---wegubik.pdfIn PDF document text
    • https://norservis.com/files/files/53916072696.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/mibuxit.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/66572187814.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ovo7ssomotu0vq599evds3cv6i/xulenogegawajas.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/lewavopapiwowusobezubi.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/fajoligaropu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=computer+and+information+security+handbook+pdf+freePDF 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_off0000aee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE0 11316 bytes
SHA-256: 208c7c30ae65be0a8eafa505461170fe53afc961ff0a0a73393390ae5c5fb3e2
font_01_sfnt_off0000c91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91E 14080 bytes
SHA-256: dd79226fd9f04bb7df9341cb61b3bd8767bbd3e8442b9f8cff9b3bc3ab33ab47
font_02_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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