Malicious PDF — malware analysis report

Static analysis result for SHA-256 447add0da628726f…

MALICIOUS

PDF

96.3 KB Created: 2021-07-01 14:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23ca49b02227b0c7348ddb06165c5ceb SHA-1: 3fcdcd122bd2a995e90c15eb711e914f7033501f SHA-256: 447add0da628726f487b26bcc15079aa4c5acf3eac02bcfb280f30bb9a6c6e83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external resources. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://archism.ru/uplcv?utm_term=az+screen+recorder+which+country+app PDF link annotation
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/3m5uj5issgsmajforg3db0vgm5/tivugelafofanif.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b6b21474---jonajalurizu.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/xumosatixizojati.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/2131e7b3a2a4d652840ce9cbc196c7ca/juvedelifabimumogipil.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gopuxuxiverifekabubu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba8da45d08---46337001704.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/20738415311.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e65204e1d102f7a0d0b69a617584ad7b/78759292583.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/14593396603.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093e0300642a---lipobevazas.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3935167489.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab66f0c1f9---96038166992.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba10d441a6---46001469124.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/xitazi.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0587cceaa6---46304330819.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b9ab47f2636718ac63c2a6767f33b6e4/62413704002.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/fobilofumol.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f808ac9bca364f1603c25fe5ae6b7dde/juronotamini.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/96876249127.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098463852a7a---87416765820.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/71361830255.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/sdc578cn34qepb1i0aaevvapjf/58412910456.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab12bfadd---romomaxumewugus.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/dazovuwulerozubi.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdfbd21cc1---daviwumasedulo.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d473f287---goxenup.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_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 10904 bytes
SHA-256: d8ae5a5fbe013687f1c97d697debbbd57de78889059eb51e1aeb7d30533f9df1
font_01_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 25400 bytes
SHA-256: 17cea5657f72ef28dd76eeebee216681351c0b7b9fffb7daf8cbde661b4fada8
font_02_sfnt_off00015bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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