Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e77e5a9f6a4f10f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 04:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bef4b96402eb34d64b7f57a786346887 SHA-1: 45f663b64cd36e5059fc69ca7bf6479898fd327b SHA-256: 7e77e5a9f6a4f10fa1c6e4420f1561a36fe6cc426d1620be9dd28e2986e564cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common method for exploiting PDF vulnerabilities to download and execute further malicious content. Several heuristics indicate the presence of link farms pointing to compromised WordPress upload storage, suggesting a distribution mechanism for malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54ca26269---16847141111.pdf In PDF document text
    • http://nordicwalkingturak.hu/_user/file/23359481653.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/74696200897.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/6747612619.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/jaladilomidakomuvorobuj.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210909033401.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/sibusupekomok.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/12399821340.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/repejogosavotevelalatafu.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210908233007.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/posisupifefu.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/60645829945.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/ronovesisovu.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/85480283595.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210902085405.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb660a107---zigalej.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/peliw.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca0e25150---dudoxonamotowurokufusuwe.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/gobikugubob.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/nepigometaseb.pdfIn PDF document text
    • https://viceda.com/userfiles/file/tebedosoxajovumimu.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/gunuwonomefivu.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/fusopaturewugiselafuwikav.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/ponegemisivuzutotile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+live+wallpaper+iphone+11PDF 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_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 10636 bytes
SHA-256: f9a4d56ba66802cf7e32ad4c088774928501a56b6f6f16e6ed0642d64ae97368
font_01_sfnt_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 17940 bytes
SHA-256: f948fa4406d455b3446af7a412c900a3006764ecba01ffae79d9e12e1fef1c26
font_02_sfnt_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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