Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9ac9149a50b0e4…

MALICIOUS

PDF

88.7 KB Created: 2021-07-23 12:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 139eaae158e7224dd04b02faf007a2e5 SHA-1: 961eeeefd712a0105fda3f6cd872a4686f7a52cd SHA-256: 7a9ac9149a50b0e423bee8637fa2f1a60ed5c9ecacda34c3307df90dbe4bea31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to potentially compromised WordPress upload storage and other disposable hosting. This suggests the document is designed to trick users into downloading further malicious content, likely a phishing or malware payload. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sabagdasarov.ru/upload/file/60133232885.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d77f94367---61643981318.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/kopusalabazipiwufidot.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/wowidamigaviwiwazidezotad.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/6153488064.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/84002418100.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c7fd5f957.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/9dfa1e3056631d0fab4ab3d01799fa73/5922365348.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/bemovukatiwofodex.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b9482700f---binuvegejagusanedozu.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/70706312151.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5829b0c01---zorazovukuxagofimufeva.pdfIn PDF document text
    • http://schokozentrale.de/idata/veliworojafikowujipaga.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5359cf15---29236055978.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092587fb1dbf---30053810665.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/50940576449.pdfIn PDF document text
    • http://apvn.info/userfiles/file/xajowidomuwiba.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/zipifomokemebikidupefataf.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947755ca406---51459122166.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/96934173535.pdfIn PDF document text
    • http://freeski.hu/freeski/file/74548112945.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3650c0a1e---lamulaninodeminujogij.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/552a786566eddb7137b33452966f0480/benizexakekojirenenatugu.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/36149735775.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/24271010341.pdfIn PDF document text
    • http://recviem.ru/img/upload/31318650510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=wireless+communication+book+by+rappaport+pdf+free+downloadPDF 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_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 11308 bytes
SHA-256: b86460075560ebfdb5b97819c756e08fcde6eed040a77c30f4a378f791d5e86c
font_01_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 17260 bytes
SHA-256: 570cd3440359eb5dc12880545343b253d6ee390724b88acb132dedff0e8159a9
font_02_sfnt_off00013c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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