Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcc5da5bf0097ca…

MALICIOUS

PDF

86.7 KB Created: 2021-08-18 18:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3ddcc3b292a8a4a52acb1698d12cca36 SHA-1: 102fd864cf4b23dec937a45de4ce5ad236fb0747 SHA-256: 7bcc5da5bf0097cab5291f3309ed3fbb509bc59fc99631ca4189afb9fef52ac8
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm structure indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crysiq.ru/uplcv?utm_term=what+is+the+theme+of+the+passionate+shepherd+to+his+love PDF link annotation
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943d5a66f56---gejalonaxowopisel.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160836372ee877---30575542617.pdfIn PDF document text
    • http://uci.ir/userfiles/file/30633930850.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/d17u7br7e4l7of235s3la6s3v3/kudulirezekupatarojokojo.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/s4t2s1quhatqdsjdjk0bl00e73/12569800715.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f37a23491---lonudu.pdfIn PDF document text
    • http://hanauhrova.cz/files/zegajoxuzigisudo.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/89567283920.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/61368438174.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/347b8fd252eba68e6e0a88071250e552/58782732004.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d5302c120d4a470fe4e6d78b93c182fb/99667045143.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/25205123585.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/waxizapubafarunopewozod.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/joderegutemitide.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/41708390490.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9c19b909c928ad091a7db065b01c939b/bosamavimorore.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/52165479610.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c67232aadf1---deditofexakukenuti.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d28148202---52440694010.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/zozesex.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb82212c46---gipiralatepitulefapu.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210814140228721.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/kqou7k22p842j05vt7akm79b83/65712028661.pdfIn PDF document text
    • https://penal-garazh.ru/files/55049895239.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 10824 bytes
SHA-256: aa5ab0fdc0f507af1159e107818aec6fccbb8a1681068fd80c762805c3f277a1
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 16708 bytes
SHA-256: 87701ddbcaca2eab58e3cc51b6305da9ad0a7b75b9ee419242a71cfdcf5af15a

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