Malicious PDF — malware analysis report

Static analysis result for SHA-256 677ac77cdb951a36…

MALICIOUS

PDF

87.0 KB Created: 2021-09-02 23:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2de22c59a7242c1f877cc332647fe98c SHA-1: 5219930f1640ee008984a1661f183bb46bc715a1 SHA-256: 677ac77cdb951a360f00ec48cce8c93a86a393c234b742f9a5abe26af2f4be8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for distributing malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=free+download+full+quran+with+urdu+translation+pdf PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a644989747e---bomuzulatosifuvuxober.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/gaginatowowetax.pdfIn PDF document text
    • https://digicpictures.com/downloads/91501048505.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/d34fe198a4e920203a1e82e53db9fba2/jugiborafuto.pdfIn PDF document text
    • http://mosjob.ru/images/file/19956016745.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/69505606878.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/11562278215.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b2e23069d---kerelomewulezisel.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/94979935969.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d23b13a39---gojinizajagaxuxutan.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d39ded2be2---fofax.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b445b21ef59---zigiwigobekaresu.pdfIn PDF document text
    • http://fultonhighschoolclassof1977.com/clients/a/ad/adf64365ba34d951c098eb677b062caf/File/43920357212.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfaf0169fa---7617156900.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/faponok.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7pkf75eqjp0s34hseji9mjduep/41580134437.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/joxafomadabixobupisoluno.pdfIn PDF document text
    • http://capital96.com/userfiles/file/kixaj.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160852f04543e3---70755481109.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/bisagitifusulabomi.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/voxibi.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/fonaseripenem.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824efd26661---fenirisatagim.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_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 10904 bytes
SHA-256: 3831d9b476fa6dd9e8545bb57c7e717feda83f19f756216761ea9fdbc8d3bac5
font_01_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 25096 bytes
SHA-256: df31b9c01a1d5e3011bfcdfacd3e30dd321f76f2ac0571706daba132382b798c

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