Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8077c94f463d372…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 06:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 44f0a3a4c1476da0214aa540ee69fb4b SHA-1: e972a8f43377f0de317b4cfffd0c47876b96c233 SHA-256: a8077c94f463d372216e9191deeba7f39eb51ef8d12668489f8606fd65103ac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs and is identified as a link farm, likely intended to redirect users to malicious websites for phishing or malware distribution. The presence of multiple compromised CMS upload links and disposable hosting further supports this assessment. While no scripts were directly extracted, the structure and heuristic firings strongly indicate a malicious intent to lure users through external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=cosmic+campground+gila+national+forest PDF link annotation
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3a700a2d83908db85681709839c081e8/tufoguledax.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/vidunimupetab.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ef130865d26889d34878ce38acce48a0/zidulup.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/18562069562.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/9259685032.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/24869504484.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/dalobukudisamapesivob.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/gkvdphq2rgopu1ue124rqcevt3/47674778386.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/xoxexijumuvifor.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5548018678e811851f108d96350911ac/xokonojofofevalufopasu.pdfIn PDF document text
    • http://bronia.org/userfiles/file/47611002296.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/44d1e6e5c19285775dcfaa4954a99562/22452884464.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160869be442288---batupexerokakewe.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/mptqkefmveg7teb552cl84hfc4/komotowodazuvenunatave.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/65635624580.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/pobapidefej.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075f55449fae---85330987138.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c2eaec5a415bb3ab223f84a66cb0ba6c/lijisejogoxuniwezoxoxezej.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/34844518224.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3c765a07b---44745639116.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/23151801833.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/67b11dd3572cfe5fcad48a7f42266eb2/97386274533.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160858bfcd177c---14009185434.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/zebotekonoloroxigudaxu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/46dhkf47rkn4sk62eteuta87hg/37096277826.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_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 17132 bytes
SHA-256: fb3a736c978658543f0f0064f913ed8d258d056506f18c32f33069b041c9f603
font_01_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13273 11092 bytes
SHA-256: 9ff4fe1acca0c0cf9a6f765fd1d12c54b10dca7ed2e181b10b0d98da1a5c40bd