Malicious PDF — malware analysis report

Static analysis result for SHA-256 68655f54092e2650…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 08:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad446813d2ac9739ccd1c25078347d84 SHA-1: fe294dfe721b31790cf76b03a9650105e433a347 SHA-256: 68655f54092e265091ead3845669c3f185dab948444ca94253d1372939e1c2ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://chcial.ru/uplcv?utm_term=market+leader+elementary+3rd+edition+answer+key PDF link annotation
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361c8f87677---72980146356.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/zotagikelenivijakesawove.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/78691578f4b3f5ad76726e7eb0ca6412/52742642162.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/79780749561.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/mumesetusedef.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/jesufonekododusuf.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/52468337975.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b16ad134c82d7eba60ba98108835ce2/repomisupebiveve.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/siradoxi.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/30071428553.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2628b6484---12071848289.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/85863440772.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf0a3ae071---rudunijiriduk.pdfIn PDF document text
    • http://sbcnepal.com/images/file/tenize.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/ledenagawifuliv.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/78472141857.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/fexokazowusodadejo.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/bolukatago.pdfIn PDF document text
    • https://qnzar.com/files/webofanosutaf.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/76291995605.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/49106616053.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_off0000cda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA8 17384 bytes
SHA-256: 4698dbfb0d9e330a31ceb46686bf0ecfb7f0627f8216d882c373f55ea1040ce1
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 10868 bytes
SHA-256: e5479db3012d3b7f5b9634ae3a047e2874c69b156e2b172bf8339987718ca395
font_02_sfnt_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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