Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1c2bd6c579706a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 17:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 41266cddd8461eef5f080dfa2a4d2e85 SHA-1: 12c277f00544bab480d6bd24fe5a3a10601e9e27 SHA-256: df1c2bd6c579706a3b99b902e38c5a2fc60a07d9ad2c3924412cfe36d9fed3ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 hosted on compromised WordPress sites and disposable hosting, with numerous URLs pointing to PDF files. The PDF structure itself appears to be obfuscated, and while no explicit scripts were extracted, the overall pattern suggests it's designed to lure users into clicking links that lead to phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=linear+electromechanical+actuator+pdf PDF link annotation
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/1163589451.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/42579285544.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/sigofipitakinunisoxef.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/24471484104.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a86fe6a2ae4---wujikafalal.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/fogimubixuvusonusalavabik.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe5f354de1---budamisijiloxoduv.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/16819898956.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/33533695168.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c320fa56907---86652792243.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/nudeve.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/5840582953.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/81596145567.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3c21d66b---nabuk.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160912d06c2049---65896572404.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/jexifebejozagoxegikimi.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/81152638281.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/manazadenubi.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/56924831429.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/doxupazamew.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/46981045364.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/77051078912.pdfIn PDF document text
    • https://elektrona.cz/files/file/20519144205.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ab96457d06c---variviviloxetoxidoreri.pdfIn PDF document text
    • http://getvisa.ru/images/File/sujironegaxeroxuga.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_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 10776 bytes
SHA-256: b0b02c69fa24d278590bcb5a3a8415e924c3eacb18f2acaa9689cd066863b633
font_01_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11338 17020 bytes
SHA-256: cf95ffc506cd47109f724e11a412910c4bfd42f68460e0c091f97a7adf4fee40

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