Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba9dc7ff3b003b5…

MALICIOUS

PDF

91.3 KB Created: 2021-09-13 07:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26226b575c2379e05ec829fb599cd679 SHA-1: 2da49e73443fa4bed4df7f0db8c7ab782ad863aa SHA-256: cba9dc7ff3b003b50ab000d30001ea16f7ee17844a9b709428e0cc0bf3f76cd0
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 uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://jsqnchem.com/upload/files/virulamimeviwapum.pdf In PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/54816101517.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/tezovonilubafekamese.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/tutidadu.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/19307496643.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec4839ffd3---sagawozexa.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/25133731032.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/97300258359.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/basuzofurab.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/kipojuwadunasuwixa.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/87101447615.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/12175509989.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/38361917019.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/regijamiraturetopokegatuv.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06375e003---xavepedezetuwilu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4905b255a---73086815702.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6dcd47de---26774868233.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/jinikavonuv.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/84820325888.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/lojamurelonufow.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/2j61g9hga08qsi8rbd4tlvi695/sexapavidiwufefakamudala.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/86033216569.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed362b6a9---28854199311.pdfIn PDF document text
    • http://gptools.net/userfiles/file/kojuwipafiniraz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=which+is+the+7+largest+country+in+the+worldPDF 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_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 10992 bytes
SHA-256: e68e8555fa2e9dda778184df740344b7adcedc8f224a6e4be3cb2c99bc895404
font_01_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 17696 bytes
SHA-256: 8af236a4294c077a7f4756d72658d7ca127e064f539e7e805691c89ac225eb7c
font_02_sfnt_off0001474f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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