Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d53e0d1df85c31d…

MALICIOUS

PDF

90.4 KB Created: 2021-07-16 11:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 34d4301097aeb25e02d23d3d0e61be62 SHA-1: 036b82ab2c49cb7de3002b298e49ef574185d977 SHA-256: 6d53e0d1df85c31d907c2a73bcd3830fc9ebad1de9504db89082ca524cfa03a9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pixomot.ru/uplcv?utm_term=read+fifty+shades+of+grey+free+pdf+download PDF link annotation
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5563e5fb7---difisolejujuwurezi.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/a988018d4567ba7ce3869c4285ae042b/98616859137.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092d301b4a16---fuzenajamisozikufade.pdfIn PDF document text
    • https://area5srl.it/file/durileb.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/tqptc5lhm9onoa0au3qi67qvb9/92393359862.pdfIn PDF document text
    • http://gtshotel.it/images/file/66230477066.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b2aba0b9a---92542143128.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08952458fb---vuximelupebunewopadu.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/gawore.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2a57d4815---mofam.pdfIn PDF document text
    • https://maturana.cl/upload/file/25969826976.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf77a0d072---18212792322.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/9142af4085e71a66e90ada1040ae89aa/zibewev.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/76025076038.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/52444724236.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d072f7728cb---gobekadipuxajuxijamafup.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78ea1f2f4---suwuzatemikewogesim.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160708b904a5a2---85884489310.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/geduxusid.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/12502208117.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/kafemiluzerujisutubogop.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c85f16e4b---lokekof.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/lifekor.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/emhkfmtg4q2r6jdldcolf8kal3/83394801768.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_off0000fc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 11020 bytes
SHA-256: ca9bb11631c5e9beca347045ad7f347930add1c737e09ad4a90992794dec703c
font_01_sfnt_off0001157a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8C 17880 bytes
SHA-256: c192b94b707337d38b303ab57ffd24bc4ad6a54e89829ac7f5fe8f4b259e1620

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