Malicious PDF — malware analysis report

Static analysis result for SHA-256 815b1273a6d3e443…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 10:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f094688f8077bb75b3488384e1c35b12 SHA-1: 8ff5e2820b775e1c32e84328e5e36f13211982de SHA-256: 815b1273a6d3e44335c622caf5db2de8e61766cb5227a35c44e47cb85d43dc19
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=similar+app+like+vidmate PDF link annotation
    • https://clearpatth.com/userfiles/file/zijizukoniluso.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/96467840711.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/80995643827.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/nepinadogububafuzivovi.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/85191271216.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/alghaouf55gm6otjnfjqjbaokp/borikinivodaf.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/90332833916.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021941031311480.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/paninimususef.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/fibamiladuvugifafaj.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/mafenanurijo.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/nebunuxadiwunado.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/74392661322.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613950b3f075b---sawixev.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/77719212073.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/64292953258.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631186095.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/16867414638.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/ratewagozaruwav.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/83657885839.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/90678114807.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/16bh8orfuckthgs8kfhrjgj0vf/31063175437.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/sixagezatuko.pdfIn PDF document text
    • http://adice-area.com/pictures/files/titidomazumafot.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_off0000d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 10396 bytes
SHA-256: c3da85e1c2a2577a5c7440380bcfaa8cb13985e397f6314a6d781943a238828d
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 17760 bytes
SHA-256: bb0ad87335fa52095e41dce1ec9ac2d9ad058104068150ea04c54698875b9af5
font_02_sfnt_off00011dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1