Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa565e2417e2bc6e…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 09:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d694774247e83a1732639499843978e SHA-1: ad7a89e40ea1270f438627c68a74e162a0d79e96 SHA-256: fa565e2417e2bc6e4052bff24c787d4d21b3abc7bdecc773796b727aa6ac9e8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://akcjonariusz.com/UserFiles/file/90328835342.pdf In PDF document text
    • http://fu-xin.tw/uploads/files/202109122127072599.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/506f9b4eb92e209e8c227c1d2b5f9f21/dazotulajoduge.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151620378848---54525478200.pdfIn PDF document text
    • http://schokobrunnen.com/idata/19651935700.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/fuvaguzed.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/7409278058.pdfIn PDF document text
    • http://adatarimhayvancilik.com/Images/Media/files/77808309415.pdfIn PDF document text
    • https://windscrm.net/files/file/wadurusetaduxodezasekan.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/laganifisakubo.pdfIn PDF document text
    • http://aquatherm-graz.at/files/20536006600.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/60131759179.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3aadd6c8d1ddfb971ec81db2c587e2ee/rapimagomibalexu.pdfIn PDF document text
    • http://ranch.pl/files/file/ragesudodotezizozekaroz.pdfIn PDF document text
    • https://polaria.cz/images/file/95793656647.pdfIn PDF document text
    • https://reniuved.it/file/takuvuridovazujuxaposit.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/44lhqbeion89sa376e580ad3nj/mosejufurabazo.pdfIn PDF document text
    • http://ametansk.ru/uploads2/81916497495.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/sawadimunetan.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/texakolinugale.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210919113146.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/wuvuwagegirevisijaj.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/76273775047.pdfIn PDF document text
    • http://wamer.org/userfiles/file/44638240978.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447e9136aca---15491609575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=3+phase+star+connected+systemPDF link annotation
    • 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_off0000b13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13B 10832 bytes
SHA-256: 9584ce9cd3d2fafa5e8888732e4c4d89b8cd78ecc39bd0fc4f9ea47163ce5b6a
font_01_sfnt_off0000ca17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 15812 bytes
SHA-256: 38970356719f4eabe9aab24d205191fe5cdd4d882f2e89d0478a18598c08e179