Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf1a5e47955e9d3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 10:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7eb9db5e9e17eb571f31ce2ee3b33de SHA-1: 43ca0528f5b71d038f01822eee6c2a3d5ac311c0 SHA-256: 6bf1a5e47955e9d3b04c009822d1c5444f5277c53fd6b3947df655e730c2ef0e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which host other PDF files, suggesting a phishing or malware distribution scheme. The presence of compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/s418rtkacnf97blcvropf13nv7/7818131656.pdf In PDF document text
    • https://aronabritcan.com/userfiles/file/75217357254.pdfIn PDF document text
    • http://bdn10.cz/files/file/vipikaketedogofufirukara.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/3ohk3a2f84q3v7m8vkhs56ni64/mujezizesugimewuf.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/vemenidebodom.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/jefasixijiwali.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62011ebf49---matazelulux.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160778ffe5e8b8---39533460641.pdfIn PDF document text
    • http://kasargod.net/uploads/file/solemav.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/85720357483.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/56469852587.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b17f49eb3---fepobosisej.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8daa56faa---27123924575.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160860b70004b9---jidarinomoli.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080679092b71---kitipuse.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/70468780524.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/61465136100.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/pifepudizifagekel.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xebusobozoxaxi.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/40222314905.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/gawor.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/27623428102.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/siribuxolonavab.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077501521cf9---navipilasatelumikuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=verbs+in+the+present+tense+worksheetPDF 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_off0000ce4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 21796 bytes
SHA-256: 90dc7d563e4d481ca5ec28ac308bd6fac5ac57348e6d3b40b7b9c50b19a8503a
font_02_sfnt_off00011de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 10428 bytes
SHA-256: 7c04a92eb93ca6daad0e1009a6f7d1df349180d44e84aaf1779fe3101b5f0abe

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