Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a937ebcf002088b…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 22:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1cf9ff2118283b2e0f1878334215fae SHA-1: d266bad25f34599691cb2edd3e497a7c00c2bc44 SHA-256: 7a937ebcf002088b5b589b45c976195b6059588341d122bb7f45a19f66114046
204 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a download button lure and password instructions for an archive strongly suggests a phishing or social engineering attack aimed at tricking the user into downloading a payload. Multiple URLs pointing to compromised or disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec9928feb2---13831234322.pdf In PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/23364d933ef1f294b20f7d63003c423f/32315364204.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d542cef7a8---78253456173.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/be8134c21522c81134ccf1cf4fb97bff/lerosebamebukipunururo.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/fotavajetenel.pdfIn PDF document text
    • http://jar-ted.pl/file/jaredupax.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210528000112.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/nopiwapodi.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606edf60163f2---85987340073.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/17702779998.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128be9433c2b---zudosikagixusawido.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b770dae6---bifonemunefilixafevaxola.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/xepoki.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/27364874252.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/64cca1958382fdbb39e65483fbc1fe46/fepasejoge.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/42379143752.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ad81bc41---13425015131.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5562aa492a---wegigizuzozilufu.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/biot0rkonobqpvobqq7ckk9t7e/kigewirojobubuw.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608533d7adc0c---julozubuxukixupa.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/kigurawukojilatimovase.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/sorizusoxekijaxojar.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b904e0df79d---roxefigidasufatuxafinoni.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/wasej.pdfIn PDF document text
    • http://air-ned.com/uploads/files/98807657281.pdfIn PDF document text
    • https://invest.pl/userfiles/file/bapetesowegexapagazubepun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=irregular+verb+past+tense+worksheetPDF 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_off0000cb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5B 10872 bytes
SHA-256: 4ea0b244a431c121719ab61b598e911ca663eff4686f0e6f87b69b8fb5ef605b
font_01_sfnt_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 18808 bytes
SHA-256: c252ba5ec225782344c40a0a7a343fc28ae43dc9df057f72e3cc7d4d06d849c6

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