Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4242306c91e9e65…

MALICIOUS

PDF

86.1 KB Created: 2021-08-02 15:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9134c5e85571e3fc3d519681476dded9 SHA-1: 15c274955745ebd1648c149e9e052f1d14a4d992 SHA-256: f4242306c91e9e65b4e383a6ca2fa6987bd440fb8de838e134413c7f415a8f50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF-specific heuristics related to URI and link farms supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • 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://crewmak.ru/uplcv?utm_term=how+to+use+cheats+for+gta+san+andreas+ios PDF link annotation
    • https://ddshower.com/ckfinder/userfiles/files/wedazu.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/309980d95dc8b709b7af77131f3c6646/73895370131.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/xujunuxotutadusinagakitos.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/r49deu8og936na80qcpoughsc1/49536183575.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t9ng7r3hf0vli254m0qvbfd501/topuv.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/68971099181.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef7741989e---mipowotuxufu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/247a979c8bbc6ffa485925706af9f433/87967580132.pdfIn PDF document text
    • http://gdgom.com/upload/file/210710011249338160l3opa77b4yg2.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/namisodona.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/94031735539.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16100277edc97d---bubuwiketobij.pdfIn PDF document text
    • http://licausi.it/userfiles/files/soxorisup.pdfIn PDF document text
    • https://aaaxxion.info/images/file/83309715408.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/25271457498.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/fulupejalaxigi.pdfIn PDF document text
    • http://rotang.net/userfiles/file/gologikutexisofek.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160742cc955d75---47366774656.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/katizezurutorifejifofiju.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fabfb5c468---wemev.pdfIn PDF document text
    • http://dztechfin.com/upload/file///xigenoruzojuj.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609494ebb9706---7440833323.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/kakoputiwaz.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3b0ca5138a7aab3ee1d56e30820a74e1/fifikotek.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3b5487a344cfcc3140f9e366a9fe5c0a/ketotadugasovizabexekiz.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_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 17428 bytes
SHA-256: b0721b18797cd164e14c7df44025f3e91a83e52cdd4daf24fa58706126c20a7f
font_01_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 10888 bytes
SHA-256: 37aa4e0e412ba3f1a2557acbb30b5fdb61ca1663b7b23c3ad86c99691ac8d834
font_02_sfnt_off000131f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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