Malicious PDF — malware analysis report

Static analysis result for SHA-256 4575683c90257515…

MALICIOUS

PDF

95.6 KB Created: 2021-09-01 08:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac73129b38e8efd600edf4553e8455de SHA-1: 0a289d83f0b21761463e3e2ad10a08f691aa9ab6 SHA-256: 4575683c90257515579a3163dfdd50551312e0aea7f74415c00886c58588e9df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=mf+hussain+is+a PDF link annotation
    • http://podlahypilat.cz/admin/file/tatovenakewubenisol.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7d2ac97a612c2f1715c33ef624c192da/26462807184.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/17561533670.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7b541708---maronururewu.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/91774969103.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8866f3809---daxelobodape.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/ea3e8b35b27a74ecd3a778d59ca022cf/53309480197.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/73901622574.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f666dd494e69437f24dac0092de8d6cf/3655876410.pdfIn PDF document text
    • http://iphysiology.ru/upload/rimoradirososor.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/noxijenoxawiweko.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bf4175748---69412445311.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/vewusarijepewudowurebamaw.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ba9367a0fe60f5f3e129a0002032252/19235613371.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/vuvapomixijozowola.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/594a0f9ad3c4f5d05ae81cd61ccd5488/fufeb.pdfIn PDF document text
    • http://zuche0551.com/upload/file/87552655513.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/susowoguxukew.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608aacc2bb702---detapalinamulid.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210829_061258.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/ed2442544ee8f38917b07c69e9664c2d/23684153148.pdfIn PDF document text
    • https://baptistfriends.org/media/keviwegusexaz.pdfIn PDF document text
    • https://ovalpolycoats.com/media/gusujuxozatanumagegatu.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/sunomefe.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 19664 bytes
SHA-256: dd59efda3e8d3ee6722426fca559a36e68e862ad8be710d2fe05a90a340bf6ed
font_02_sfnt_off00015a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A3F 9908 bytes
SHA-256: 5be2fba367bc236d94d9eb8bb7bd6e2d3f8b14c3166ffe4cc2bce3984baffb41

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