Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c74d317afa4d51…

MALICIOUS

PDF

100.0 KB Created: 2021-08-04 11:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 121c13843db82b52505a436d8ccf1a8c SHA-1: a2b03bc6c7cd798e127dee6666d467cd7a59fa34 SHA-256: 15c74d317afa4d511575fdaa10823efc68a7ade637972aad643abe55fe521b23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress upload directories. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true malicious intent and potentially distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catwalkdogcome.com/editor_upload_image/file/92350841373.pdf In PDF document text
    • http://kameleonhastanc.hu/files/file/wizef.pdfIn PDF document text
    • http://st03.it/userfiles/files/98016987042.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161010d8489f65---vavofupabaga.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/juruzidifidisu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b027aef645185d86ad70c84df75cc62b/80686258519.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/sexutugetetotunumifuwi.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/90363403812.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff0e8583d---41988175738.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/zupusavuwekul.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/vililomugafujojaxetewe.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc4f3b08c4---bidurudobosuju.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec4eee37c9---64473266433.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b423c7ee52f---11051004993.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fcl4jj72mvd1k6ktqb168pk2l2/52300883767.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/659e82e4494a8ae7f1cb3236274840d5/lunegof.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/suzimugomulipegefalol.pdfIn PDF document text
    • http://chayka-svg.ru/files/74486718499.pdfIn PDF document text
    • http://synowka.pl/galeria/file/79527985780.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/sederuxaparapiketexaduva.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/14067940833.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83c297298---kusarutot.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/rovopinowupilileworavafep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+is+a+rare+german+shepherd+dogPDF 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_off000122af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC1 17824 bytes
SHA-256: ae92e432032810d35f3b3b9e5db870fa2bba2d5751e464589f4c118de6acb612
font_02_sfnt_off00016963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16963 10788 bytes
SHA-256: 83699035c5f1e58d960fa3dc370617a4331fa734b1ab58fd80d0acd7583a935d

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