Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f5b63fbad4705c…

MALICIOUS

PDF

95.4 KB Created: 2021-07-16 23:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 242ffc94cdf298f66fd7831ae4a512ac SHA-1: a3ebc0b2d58244a5a28a1136b19cb12726bf7114 SHA-256: 87f5b63fbad4705cf362e05d12be23a298aca39b5683e82a244afd2fcc3f1b90
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload storage. This suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://4x4autok.hu/userfiles/files/9977424760.pdf In PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/eb5db8bf035ecbb8878bba6a4f3feca0/kefapazemikojonexu.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/20055327382.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f79d669c10---7701653523.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a1addad31---tedeleworamerotef.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/tulumadikikixatazamitid.pdfIn PDF document text
    • https://beliangka.com/contents//files/76804509291.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/br7s7ut0sgh02rrupjm56acf85/97938543488.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/p82pa9s0e2n5ceiu28ug5agt07/2518269322.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5dd19bab667acd97c8399940de7d2ba3/javivovi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f4eadceeb---jijozinagibesawivixeko.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/ginupenadu.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/c6706d411dcf0a2925fa19b2a9338161/kotoragapuriruvikixoli.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/kaatrcvfgr4ubfgdehsbgos462/sofujuzed.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/nevoxakogozabilujalexa.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54619074341.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/jukofu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091106bd57db---nitud.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5v24nabe0hljf4opb69lc82tnq/49787438647.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/jotuwewejixejozunadapaxuv.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/pg9qs8s2nedviun6q25lsb2dld/dexugivatenofenunexeki.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/mowapanodizubaletoj.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e493ed0c1---90059264730.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608118d2d7ff2---foxes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bursar+interview+questions+and+answersPDF 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_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 10648 bytes
SHA-256: 07af7f1e50b6e7f153d404ae67554e91a714330a9db2fad21ada69598909f1ae
font_01_sfnt_off000128be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BE 18000 bytes
SHA-256: f10d88fdd5837970a0d5ed284d02a5c5765f8ec745c8053f9f2564a1e8f6544a
font_02_sfnt_off0001581c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1581C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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