Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b57dd0fa30e7d6…

MALICIOUS

PDF

83.8 KB Created: 2021-07-15 16:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8364d36f49240160a25d04c8761e8eca SHA-1: 4c42b386ca1eb1dd5ce98b571b42385b6ee9d368 SHA-256: 58b57dd0fa30e7d6158cde75f4cff420da2658b22c09a288499e00a340301443
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery via these links. No scripts were extracted, but the PDF structure itself is designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=secret+message+to+crush PDF link annotation
    • http://www.jucadent.es/ckfinder/userfiles/files/lejomiserid.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fe26d78e80aac07876ff334c3080c71a/mojadatidebiparin.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d57bf733---23042717843.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0jo1r4v1475b43qncu6raenq63/kazokerafipaf.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/supokanamekigi.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/nixinibosawom.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/081540b062b2aded9e30bea27c5e490f/53265117964.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/92581201883.pdfIn PDF document text
    • http://fygl.net/uploads/file/261458195996.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/88344812279.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160adb873defcf---gakogimuwuvivajos.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746751b4246---59606646337.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/49smmfehlgbuse65levvd42ib3/vudox.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a610c4caa---89704163059.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ceei5tamd2ghnkeicdq5ugalgs/dogidajigif.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6dbfa074f---zijuwavoxolawelapum.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/tavozusigigepu.pdfIn PDF document text
    • https://cape-electronics.com/media/file/gumebiwonemukilanekeg.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/vokumep.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/15826780572.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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 10612 bytes
SHA-256: d48280428b8b61e1ad9fec7ecc3b4dd68d277d837bc88e23ac049ab77f0ce0fd
font_02_sfnt_off0001196f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196F 16004 bytes
SHA-256: 8c0adc4ffd9a91215d2cea50f9b33048f287434374bdce27022ffee7c39b53a3

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