Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ce61c8171d859b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 19:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 466b17382376c2779b053c8ffba0b3c5 SHA-1: 39c9f8c50ef1dc08bea2458ff14a10cce2c8ef6e SHA-256: 52ce61c8171d859bbfbd863e4888676c415c07d3f5f0482a77fc8d7baff3895c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607128cf2cbd3---72725525085.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/10996936774.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/zugefizulenufesif.pdfIn PDF document text
    • https://chp-travel.ir/data/file/bumavedibejixopuje.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/768a6598a929582f93fdfe744064803c/wusasuxorami.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/2d9413676dc8b24141dd9a5f70b71ad3/xelefoj.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f8907e24e---47348939008.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab5dc1fad8---xepugimuvogobaxexopipajir.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/12150044652.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4160532d36---rotinag.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f481b0745---9403097502.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/90465966159.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/vuvem.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/75827463333.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609885e957b36---xalevesizelefarusi.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/97574151662.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/87492463994.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/9hfe0md3nchpts7dl2g8st4t9b/gezimivubite.pdfIn PDF document text
    • https://panoramabyty.cz/content/zukajezafupekipon.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/lamofitixubudolusidoko.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/xekokofifunem.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/dapamoxonuzut.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/72691922145.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/rofuf.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/59568067870.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/navuparuboxavedute.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/megazumirajugadumofipufi.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14dd54d3f6---fafodufitofawalizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=exercises+in+machine+drawing+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_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 10976 bytes
SHA-256: 3c06fb87c64479a99298a7b28f54a2a48f5b1d0fa4c008dbe99e731dabec5174
font_01_sfnt_off0000fcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD1 17228 bytes
SHA-256: 074007d8a917a6c067cfb5c58c1a40b0621c42e881b863d484e57ce4b515840e
font_02_sfnt_off0001295b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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