Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2bf0c7780c5465…

MALICIOUS

PDF

71.9 KB Created: 2021-09-02 09:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb4ccc9677bb26f1f10e76dcf3d043e7 SHA-1: 8d72eb6a29a1e74c1d2c3f909d7dc9c48cf5ac02 SHA-256: 4f2bf0c7780c5465919078b94b4934ce6626b8779e91c698f2246190cf87df4a
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious or phishing content. The PDF's structure and the nature of the URLs indicate it is likely a lure document designed to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/73093120822.pdf In PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/mokurexarop.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16080e969c1172---todezabulujibudu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083553fbfbf7---sakexemogurijununazip.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/68961923209.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/94540012765.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1611453e418613---repiwediza.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/fugigataxapevar.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/xipon.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/lesuvusidedinupum.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c908bd9445---lemovo.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/u869c46lnl1pugngdt69a1bmua/ruroduxejafewitos.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/41979880029.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/bj44a94fgv6p0pr80vtd3sg67u/jaxaxow.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8fb0a2a099e8dfa2b595bbe9ae549671/40773708450.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2affa3b951---67618449343.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6a706264def5dd7a9de7a9fc7851a59b/93906136746.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b11a0fe3---zipobevoxobenaje.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b23798e7e35---zodinumuramerujedufi.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/tujesagere.pdfIn PDF document text
    • http://moneymaker-gold.de/files/89604413740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nuts+low+in+phytic+acidPDF 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_off0000b8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FB 10656 bytes
SHA-256: 6dc1160ce5eef8f6ae5866baf2cde2770c410a128b2a597fefb0521aff409005
font_01_sfnt_off0000d167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 15248 bytes
SHA-256: fc4b8979b76aafb5f1e4d455375b906e495fc4379c90d3a68c6620b227b3b9c8

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