Malicious PDF — malware analysis report

Static analysis result for SHA-256 270d17918fe99790…

MALICIOUS

PDF

131.5 KB Created: 2021-07-03 09:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 085a81e00d68c8156cd935dea9cc7947 SHA-1: 5106f7c495bd9889d8b63c9337b066fe87f893ef SHA-256: 270d17918fe997901fba21c3c709e5f912f5214d3414fe433c21f6bbf6e3b57d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external URLs is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=supervisor+health+and+safety+awareness+in+5+steps+answers PDF link annotation
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4517fb45b0---43225429043.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0e06fa7b44416f923c267d939e946d8c/88537444815.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/vibejomatusawatupa.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/98827508075.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/wodazinosakagimovavope.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/ca7b664ae5cd9bf6a7695046c2e1f588/jelasajenetomiles.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/74885199409.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/tegaga.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/69641ecd7d77ca8281d612c674059eb3/46937886828.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/1497619086.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/vixoviboximigipowod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56005d6858---konerabusafu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4b9f19870---32721749863.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/xanititabesozuzobexok.pdfIn PDF document text
    • http://www.toptehnik.si/images/besabuteti.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/jk6hgah57pgepbce2d0404ocg2/timinu.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/nogajevef.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/penoto.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5fb10a44b---26672258933.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd681b1aa0.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f85c57e72---sejodo.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/xosus.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b486970cbf37abd08ce7824cab4d4dc7/fegojinizokejopita.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0bb61ffd---vonamafobaxirepezepa.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_off0001926b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1926B 1240 bytes
SHA-256: 548550beeab23f7d0bb8272967e1b0b246e260a8ab61889fc6223adf603ad230
font_01_sfnt_off00019992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19992 19616 bytes
SHA-256: 7e4af6ccb35148458f488a1d176efcd9da750eef025269d1f39e1ed3a8447078
font_02_sfnt_off0001cd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD0F 11168 bytes
SHA-256: 206248a342ae74dabffce9f8fba6c2ada838ce40904c814b9b309cf2774cefec
font_03_sfnt_off0001e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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