Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a52378c5b1789b…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 20:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69cf1d1f66ed5c12ade0c17381c1023a SHA-1: d28deb31293dbc16d099029c13e6c4ea7c00d5c6 SHA-256: d5a52378c5b1789bb42f93f0be32b3fe06f823ee1f84fb829410864b3c8fcc1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/m5f5nqt75h0l2d0fr13lln9oqb/pazinipanafaj.pdf In PDF document text
    • http://silverk.ru/img/lib/file/20904347791.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/84420699086.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d9fe22396---58563982218.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/xusemutanezevazogawi.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/61161614718.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1287899e71---19946393768.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/37cb5615e03a56f6241c1241d80ebdf1/86132217693.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611d09f0ccc0c---rotafosapalatelesavivas.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/aai06bcbuvbrlf2bcosed1eunb/zariruzavujoxukij.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/11618324598.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29414d8a36---71526610157.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/61309866525.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/99017733639.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e8506bf65f0b67731dc0b7d43f1e4670/gevugokamudapazonozig.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/dozejonipovawomiwupiwex.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7bda03ce704d07c082f64e3b150e6200/sanozirop.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/gelemefadonusedu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8eq602pn54ks024o5kq5ic7pt2/97339941993.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/kinisewi.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f8acbb4ca---18491154769.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/zajekarisixonazix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=macmillan+mcgraw+hill+math+grade+1+worksheetsPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/88491050694.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_off0000c16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16C 11040 bytes
SHA-256: 723df21be0f1cdb45528f592431b6ac2e16f002abdf247994302449ae75c8c27
font_01_sfnt_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 16484 bytes
SHA-256: ae58bf8b1fff5265d430b7d53606cd4e6fb0e003654794a14207d6f104baf5eb
font_02_sfnt_off00010544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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