Malicious PDF — malware analysis report

Static analysis result for SHA-256 0197f23d7bce778d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 02:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 962650f91156f935a30cf2e913918dd8 SHA-1: d260f1dae5a81dde5e651eb3a5a7214c81b674c9 SHA-256: 0197f23d7bce778d6d23a020c100303b29a41eee7fc3e6bc621f6f7fda5232a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The primary attack pattern involves luring users through a malicious attachment to access these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=watch+the+ten+commandments+online+free+putlockers PDF link annotation
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a7ae0b6ea---kupudalokonirij.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/25769057436.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/rasukem.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/fodoboxurudowi.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/37212268175.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/82735672773.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/57655981216.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210917_1C033703B97D6574.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/26589723908.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/fcc049b0df46eea67ee849e7ff5f6280/76367338043.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96070977997.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/69841170523.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/xagifurefifadewulako.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f51b423984---sodizu.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/86455865133.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/sunodatok.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/molufowokazimaxeza.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132c424731cb---1108881165.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abd0505120---kirog.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141af83b8cac---79993685444.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/jezekesedotegeluxete.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/vexofex.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/99644154802.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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 18348 bytes
SHA-256: 996b475b5c50787298826dbf5089b3118cceb76169f2b349973c0ae57de92c0d
font_02_sfnt_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 11072 bytes
SHA-256: 60d49e6c49b94e99444fbce7bd54d8d9f5109086b058b978c19ebfb18761c567

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