Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b041647deca903…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 10:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dfb9de3d06aa271dbedd0762f1ceadf3 SHA-1: 09fcde93d535f4141c511c85f0e7443a7f66cd58 SHA-256: b5b041647deca903d46655ab16e8d420d66fd7dabaceae4b3f709141da8367d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=pihu+full+movie PDF link annotation
    • https://middletonchambers.com/ckfinder/userfiles/files/nasapevajagadoge.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b06b1bb7634cc8a9268de2c4cf4a95ef/87286212429.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/somaletaf.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/3303129506.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/31009488667.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/fuvurupufide.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/todemosuki.pdfIn PDF document text
    • https://clove7.com/userfiles/file/galakuduv.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/84241809126.pdfIn PDF document text
    • http://cy2hand.com/userfiles/xewifejewivosafupid.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/rubagizirizaximimuwa.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69972290951.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/39260338437.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210908054558.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/motiraxizolodagafotoko.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/jatogexedu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447690674a0---68396439414.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/zenujozonofu.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/92346250571.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/7f3538162661f0a9c29d6a474f235f43/64123234287.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/tojutiwaxulomu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144853becab9---fofopalelovotiwoperas.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/detusevoxifaxok.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_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 18260 bytes
SHA-256: 1ce691a6f575a9d5e785bd715299be65d7124eedd73068a1e3d991645031cd31
font_01_sfnt_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 10016 bytes
SHA-256: 10ea96eb1419d5e0fa288d5ea647c9b170975b55c6071193bd8c3e58225213ca
font_02_sfnt_off000127a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1