Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ea94d9bce775d7…

MALICIOUS

PDF

60.9 KB Created: 2021-09-18 13:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4eca5d2091a8075f4090421328fcd3c0 SHA-1: 6b5ce9ebe315b93a04a225c0eb082310341334a5 SHA-256: b1ea94d9bce775d7ca84ce44e0ae98a9d184444bb9403498ceffaf214d1b421e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier further support its malicious nature. The primary goal appears to be redirecting users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6927

Heuristics 5

  • 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
  • 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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cc8446b0f4341df58d077d94babb307a/mowixidolonoxuvu.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130365708fd8.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161418dab1ad6b---tipefibajofuroxexunu.pdfIn PDF document text
    • https://phr4u.com/files/xuziwozopirubenisitetez.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/boxefa.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/kaxawopiwujawo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae00a879d---73968485106.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/najixugegetefuzamod.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/bepoxaripizabixefesoto.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/gopifavurikazovefagiduv.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109111435129278.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/72661470804.pdfIn PDF document text
    • http://metapolar.hu/tmp/44972793278.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/wojapiraturefigixogob.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/kusuvamotejivipekifabiro.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/40406281135.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210901111916_yi5gdo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e86f2a460---nidugopikimoxejen.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/benolijezijesij.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/dizojetilozegabutu.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/jixijase.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/rusojovenajaruv.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/20146771102.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/vapovisemozalotorefejopi.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109110520235669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+hard+reset+moto+g7+powerPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82C 16056 bytes
SHA-256: c719b1f741e2ea6c22f0f2289b50ffbd6a698d082db54948d512ac235482cc5a

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