Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f774a18a904bce7…

MALICIOUS

PDF

76.5 KB Created: 2021-09-09 19:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d94cddd3c34cbaba0de8b7560ef41d89 SHA-1: e094055ba96682519cd072d08e379b2195fa3620 SHA-256: 7f774a18a904bce707c508e62f0298d575d1f3d8ba23f0f6428ac6d1d1a56397
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=apps+download+games+free PDF link annotation
    • http://taiwan-casters.com/userfiles/file/66124526126.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133929117a2f---70232268220.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/zinozagurom.pdfIn PDF document text
    • http://lejonhund.com/upload/dojikekanukigobogatij.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/gowome.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/fagenaxaluf.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/3916359498.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/11399150173.pdfIn PDF document text
    • https://kultmotor.hu/images/files/9821276764.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/zeruto.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/sodarajigefinibumikuvop.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/sevolubeje.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b41612c89.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/87389934064.pdfIn PDF document text
    • https://satyawatioverseas.com/userfiles/file/87848666448.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/77027356477.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/56491072652.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/90716293295.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/38322669632.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/vogafaxi.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137660bc9b0f---sezipateromomuwa.pdfIn PDF document text
    • http://rhondachem.com/d/files/65987711280.pdfIn PDF document text
    • http://redactron.com/userfiles/file/duvunokidogakolasegage.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/nazimabedazelubogutit.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_off0000c69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69F 17656 bytes
SHA-256: 2e99da03d62f4778b2a861cf412aee8d2d74344e3f9a8d38863f5da6247e3e3d
font_01_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 10720 bytes
SHA-256: 97b331c2a1ce90300f2fb46c86f811db85fa8db7eeecbcdff0984e82fa52b06c