Malicious PDF — malware analysis report

Static analysis result for SHA-256 702855aa1787c4d9…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 15:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca81df732231ea2fc8493091e99d1d9b SHA-1: 963a4a6951d112364025ca7320291487ddb2ded8 SHA-256: 702855aa1787c4d9fe288da8b479ea4613876f256eb8b351efc2210edf2c0df6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged as a link farm, with several pointing to compromised CMS uploads. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8669

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://philabc.ru/uplcv?utm_term=trigonometry+questions+and+answers+pdf+grade+10 PDF link annotation
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/bibewixofososuneril.pdfIn PDF document text
    • http://cx-gl.hu/images/files/48843944542.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/vasejikakijosiw.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/35339946477.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/2960748282.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/89852164.pdfIn PDF document text
    • http://iteequipment.com/clients/65150/File/57329720406.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c722f9e11f9---motuxiwakenametumilujoxa.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/sikaniralarafisevuzobuli.pdfIn PDF document text
    • http://www.siposferenc.hu/html/51569218616.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/bubizatijidub.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d2360633aab---masidogafadozakexazizurut.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/42436947757.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc17e72cba---doluxirerukuxo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608019335f0a1---rofigoxiz.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/xopedavozetoduz.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e12794c232b---21826203187.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1901912806a8a6b381f1ce0099b9082a/9184403712.pdfIn PDF document text
    • https://mahae.hu/files/files/13814880368.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/polafoliloxi.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/60832045726.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/wevokuwoposovow.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/74642471570.pdfIn 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_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 11380 bytes
SHA-256: c89c2a73fa9707e3d9251e2039012b56107ef9988dad90d97669f3e267bb38df
font_02_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 18296 bytes
SHA-256: c2761bf8d7b3ca8953e6ac918aaf90c8d48b4a411080b9aa876678f1aa4b1768