Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50a7207aa06ad3b…

MALICIOUS

PDF

85.2 KB Created: 2021-08-25 23:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e26b8b307125cea24a46855a08a08430 SHA-1: 262a26a44893ec72af70953edaaae2106cb83750 SHA-256: c50a7207aa06ad3b05dd22f7d07d2cc2be2d6498fd72aee593328e44c62032ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous links to compromised WordPress sites, specifically within form upload directories, strongly suggests a malicious intent. The ML classifier and ClamAV detection further corroborate this, indicating the PDF is likely used to distribute malware or redirect users to phishing sites. The embedded JavaScript is likely responsible for executing malicious actions or facilitating the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4370ba87---tuguloperosewigamejonosi.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/kria8ko7i7q76tmsn0cbbmqvs1/vudopa.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/85670393251.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c7aeb4a97---81931806655.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085103cd0702---zawoseguxagilax.pdfIn PDF document text
    • http://sbairs.com/datas/files/60701345569.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/vupuxisezeza.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078256041539---2120936436.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/52061121540.pdfIn PDF document text
    • http://deltools.com/userfiles/file/jofiketerakobajatav.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/73141376346.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/bitonugijimazajupapodudim.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/putagizejufatapom.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/db01228b73a1c4f9f80ee867f4fbe502/nalife.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/fosunudi.pdfIn PDF document text
    • https://zhansq.cn/upload/file/99769030567.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/fivenu.pdfIn PDF document text
    • https://activepymes.com/pub/file/21040224308.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4g19ao67vk0t1phuboq41meu65/dapakefawulojewav.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/bezat.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/miradevigomukupogasujifov.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/zuwakorepuxi.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4e7238c3f---fotod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=section+92+evidence+actPDF 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_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 16304 bytes
SHA-256: 5eb6760a352bf0db3c7bdc7dc2ce36cdd3169b84d5b9cd08019ae923dd9338ee
font_01_sfnt_off00011665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 10480 bytes
SHA-256: bb4d7f3d876e38db17d55f85d61d3e794d08cc98b63ec8e6c301ae6d388125d8
font_02_sfnt_off00012e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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