Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efab86503b7a691…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 17:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5950b5a2d7ae02a1b983afb3dfb47a43 SHA-1: 0065229321cd98b99813296293ec2af719509d83 SHA-256: 0efab86503b7a691bad4b863b72e6d1c28e5b028146ad8f2363e216d6976cf7d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of many external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=iphone+12+mini+in+bd PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/j1ml267a0sm4ao31s3uorvguj6/8281111149.pdfIn PDF document text
    • https://blogsma.com/files/tijetep.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/75161805540.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/debikezubevevazasejufo.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/jonidibozutefagafotenami.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613324b1092ea---38093460691.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/8d47315a374b71e1636ec21a053c9707.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/17948099598.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161372a97a4761---15902789334.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/gikugibepoduxo.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/jatemavolunewu.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/69888176714.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/82590839133.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/mewofobatizopafuvokurekap.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/93781936319.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/67300670317.pdfIn PDF document text
    • https://wita.lt/images/files/60305456396.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/suragobedor.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/xadawug.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/noridokufo.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/wuvepuvugak.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/limer.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d26537d4146e409b54581af02224e83/kulefovuritesigugijupido.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/rasidoruwikoxerovi.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_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 10348 bytes
SHA-256: e96c69cd1101a7f0767b13b6f8db6e67de758161d4a58cbd100cd0dca844ed69
font_01_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 19040 bytes
SHA-256: fe89132a89bc4f8836a6922e0aae3d73d4676347540c82a57503c5327845c6d3
font_02_sfnt_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1