Malicious PDF — malware analysis report

Static analysis result for SHA-256 221961cd0dc3625a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 09:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f304a62e1cc1103b4ea1c3b3d101ce8 SHA-1: 4d8f5a66f5c74359ef994362be476fbae3a35a52 SHA-256: 221961cd0dc3625a55540cd9cb9743b388cd3b99d0f6f4d5eddd11760940d194
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cpsguffanti.it/uploads/file/2504049004.pdf In PDF document text
    • http://grandioso.asia/editor_upload_image/file/manuwof.pdfIn PDF document text
    • http://mrybalko.ru/files/widemidizitetigu.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/37586668114.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210902_160053.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/pibigarobol.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/fodexolawiripa.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/17502758302.pdfIn PDF document text
    • http://jar-ted.pl/file/pomusabibevagopawa.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/kakubebaxosero.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/xevosigo.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/effb2bda939dedbe5b4fe9429864b3b3/49364755129.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/kikojudizetaxepojuraxi.pdfIn PDF document text
    • http://aquatherm-graz.at/files/zozazoxuvesiwotasaluwetix.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090408483785632.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/pijusalezituxo.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/tirerudininetavagabu.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/wapejewogamavidimozu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613619e6c2614---gaxelokugexisa.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/40243194456.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139203f28ff0---66373341931.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/gagomigubilarewazebeko.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/48819718365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ultimate+guitar+hack+apkPDF 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_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 18624 bytes
SHA-256: 7cc627bc1f0c8ce1a59292869997aa6aa404a4e9a21580131c5260d8296717b5
font_02_sfnt_off00011b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 10628 bytes
SHA-256: 9c20d366a759bde2247024de8841632cdf28b3584cf169838a3d869fd7155811