Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd767256cca53c9…

MALICIOUS

PDF

101.4 KB Created: 2021-07-03 06:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eaaff3b739cf43c8eb8c74e5b5de050a SHA-1: 89914805fa3f13d64134cfaf3e047e9d7d616502 SHA-256: bfd767256cca53c9f8a244184ea6bb0e5231f01103a26e3d5cbd30fa84467b8c
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing and malware distribution lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick users into installing a fake browser extension or update. Multiple URLs are present, many hosted on compromised CMS platforms, suggesting a distribution network for malicious payloads. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://pistant.ru/uplcv?utm_term=red+hat+linux+administration+tutorial+pdf PDF link annotation
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f21823f0---wegirixugomimeni.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/d8uk9je1ns7igkdmkibin9gcb9/duzalumutevuxevinosawu.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/nupunuvodexot.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/nimubojarudiwenuvotiwiz.pdfIn PDF document text
    • http://fields-on-earth.com/xepenenuweniguxazosupen.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be482948e66---sorirevagupisevajijana.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/brlfar1dn5tkq72f547aq5pmeq/7718933436.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/ebd605828890b39c0bf5e34b71aced0d/sigajozav.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c5c3834cf09adf97697e02e6695a862e/nipufizoduxujumaxobet.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/kevubagawebir.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c72afb4840d37aa935cd1adaaf5bb921/40757618744.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f7fc986fc---99737717716.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/julekifinug.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080933883df7---boponapukizoxur.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae740898f---18893208123.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f2bed3d15504866d7db2ac809474b595/jegobaboxaveruregawefa.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8ad0a818---37150388930.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa7153ede1---delujefumikametofomawep.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v2p4co1s6qkmjtpk2dtg0aik2r/muzotir.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/zomedefawuxepowugupazab.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/tesapiru.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/936d80d8d9ea80d0613e9f2c5ae1c893/3794969538.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/6c2575f416725535b7604d8c600ac546/zapoborivebeta.pdfIn PDF document text
    • https://josephdIn PDF document text
    • https://youtu.be/uXD-NuguhzcIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 11008 bytes
SHA-256: 72dad45d714480c6eb81a637a06fbf9911f88d299e5b672b3e52e5badcbc1e52
font_01_sfnt_off0001356a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356A 17924 bytes
SHA-256: dfc5d646a0f65e9fb93a86f0741a8ac5abf37df3ba7e004dec8a2671adf580ae
font_02_sfnt_off00016421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16421 2688 bytes
SHA-256: 9a130951a291cd9bb0a397a879fce5fc13faa3b3cc1a31c8f2c143422cdccccc
font_03_sfnt_off00016f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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