Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa539ba1f8ccb7d4…

MALICIOUS

PDF

108.6 KB Created: 2021-07-13 08:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: edcf98e7c89fb12224bd4454b02f3eed SHA-1: 2af6033f7c591d9d22f73aacc5023a0119050aae SHA-256: aa539ba1f8ccb7d461f635830a58d869bc1a7fa204672afde0966d63f674e68b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://crysiq.ru/uplcv?utm_term=cozy+coupe+instructions PDF link annotation
    • https://travelsafeway.com/userfiles/file/21270030347.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/6ee498d82931f301b2753220f20f35d9/43418163194.pdfIn PDF document text
    • https://go2germany.ru/files/file/74102784242.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/divof.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/426190a313e82fc295c636da7f3eafc3/tekulafimamulafesutuma.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c073098cb9---28688095698.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/fewidabelujareta.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/pipetowewinuxibuvifaf.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c140f5b0009---57495490655.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097325f88c2f---wadolomafunusefedemuka.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8235a3f879---bugerodopo.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/xibug.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/44e94d9ab47b2308f4cae9ddfc6edc0b/71439586286.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cb79ce3b---76359410873.pdfIn PDF document text
    • https://migger.dk/userimages/file/99582170703.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c800cd4e41---29939524492.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/putigafodugofopuvevite.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/44902155551.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/79461390187.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/a6npit3tb3rknmk7l730cvf844/jononitu.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/zisaril.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/ziduzegojoxulifozas.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210623175030_j0sj5p.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f2b35d4ee---sarepir.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ad63aa903---mibifipuremiridus.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E1 10464 bytes
SHA-256: 18aeb269d755522a5f178b8c1e6b6a278b65d08631a0a813b5dd44c98fa03e7a
font_01_sfnt_off000141de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DE 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off000157e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E5 21596 bytes
SHA-256: 60243be6784e4f9240c60f47037cdd3931c4727c39d1792dacfab1942ae4afd7
font_03_sfnt_off00018cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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