Malicious PDF — malware analysis report

Static analysis result for SHA-256 c933df8f0195533b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 09:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f0e945c3a9258b2bc76d4c2c1f22bed6 SHA-1: 83e9af32b715674391ed361cb4cc18c030ef0a65 SHA-256: c933df8f0195533b1b31ee1b796027e4d2bfb4cc21fea320c1acc66944eb3674
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://kancelaria-perfect.pl/app/webroot/media/files/30982805748.pdf In PDF document text
    • http://x04ydivan.ru/userfiles/file/xaxuvegabela.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/jowaxol.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/tavoleganiza.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/denulegutexogude.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/nufifurupix.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/denotubobifepafilukif.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/60d69b13b70c40d68018b94c99b94bdd/43031240560.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/gijoworojosadik.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/8pet6r60g25c4igd3e4egn9t0b/ludofonodiralevomudopu.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/mapataxamimovud.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/61644416432.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607103648b82a---60620191790.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/wexavugik.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61f3e165ce---zaselubuforezopisimagiz.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/7mhdiheihdffhsifi2khib77h7/56382702533.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/e9q9kc29mf5vcbpkpqdpijrsn1/wugeguwawofafis.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/be6feb79086fad29ca45a07f384e370e/31124473107.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/99549070843.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/97794332157.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/resod.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/nusaguxetin.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa579857f---1701260503.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/10335829872.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/vosebujudumisimiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lord+of+the+rings+two+towers+streamingPDF 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_off0000dae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 10796 bytes
SHA-256: fd46f89d74b90e03f4211b61f6d3263fbd15acfd2e652f6705eb74797bee4e73
font_01_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 18476 bytes
SHA-256: db1acc70ea9aac3f15cdeb90efff0e84755b5226cf0580d440bcdcf0d7e6fc39
font_02_sfnt_off000123b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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