Malicious PDF — malware analysis report

Static analysis result for SHA-256 9947e0bd5674b247…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 09:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a7792f69073a47bfb11572b25a5253be SHA-1: 50b5cdde606ba99a18d9b03ecd33a3f24074107a SHA-256: 9947e0bd5674b24728742f5c1442532d51ea257cce600dd810a56cba72a551bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were extracted, the presence of numerous external links suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=iata+delay+code+pdf PDF link annotation
    • http://manpukuorder.com/uploads/files/xewagujido.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/zowebemutuwipukubawedagi.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/30555090968.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb7e5a85e---94408947606.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/32728354211.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/90953216178.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/85106179471.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/aac9464e532fba4b301b22f4af3f79fd/83296699968.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/57679474955.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2d2026b65db2cd1ad17618b41905d46/tupepukemuno.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608310c78fd05---jizanowerezagetu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782f94e5db0---sunumupuvivexinerosonisa.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/31073595815.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75fa33680f---kewutanirufazin.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3fd6be8e8---41918285393.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/basaxoluw.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0755ed465370758948b91907d110ce44/kuriro.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/2f7c3b0638a3cc58bb3799e17ef7bbe0/jevojujevukizedo.pdfIn PDF document text
    • http://contelex.it/userfiles/files/kedekofowezemilixesit.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/87080817845.pdfIn PDF document text
    • https://bloc-immo.com/images/9140829250.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/63762771757.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607f40d699b2d---wozefifijovigirawisudusod.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/paxijuzuzodulagifin.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/92484995274.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_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 10212 bytes
SHA-256: 2bde06e9fdda0524327e1d281b21126a76cfa9c1ebaf335f6854830e4e1b701f
font_01_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 17936 bytes
SHA-256: 17168fc1997a361d0eb54c9c8dfe55127c7149b6db6099dae2eca75ac50830d9