Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97cde2ad7678ddd…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 20:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 456f983cb8016a95dc0a3452092a4a42 SHA-1: 9fc92d5e34773ac8ac1c8d1c92e88661bb10e956 SHA-256: c97cde2ad7678ddde04086f443dd6757cd8fe46de6932ddcf8fed04dd43fc386
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, further supports a phishing or malware distribution attack pattern. The embedded JavaScript likely facilitates the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 7

  • 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.
  • 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://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe862c648---demevozemewujadoxinor.pdf In PDF document text
    • http://absolutelyneon.com/userfiles/file/36756326150.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/dejinuxefa.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ebd608d8b---lowirosinexofulep.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa663eb669---65212770889.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/60992857887.pdfIn PDF document text
    • http://art-ball.net/files/file/guwakunuvokusewojesiv.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/23152863999.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/f13b0ce8f148156b6a78418999c561e2/zowofut.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/93622258246.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/lizarisedukovokanujazumef.pdfIn PDF document text
    • https://asken.as/bilder/file/wigol.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/79378011226.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210603/file/xuvam.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610528c5a004d---62573423648.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/bigetovutiforiruxitu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ce72e0ae9---tilivog.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/oo19oljfpj2h1sf61jdb3pomp2/jekovetefebabegaxe.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/9303811691.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1612a229b749bc---guzaw.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210629215652_10g98t.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/65794813449.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/73093582781.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/gipuvoxotajunofiz.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/31630042772.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161123e4816c11---98506612916.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/zuxawubezitejikonuvuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rockwood+manual+physical+therapyPDF 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_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 11216 bytes
SHA-256: 77667b5626bb072172445e70559a94ba5212d9715634b48eadbeab4082f4c7d0
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5E 17696 bytes
SHA-256: 6c3dc1c941deacbd66a8da82bdc40896e4c2f7a5842b6f9e1101fac2f6fed6b0

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