Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b7688a52e35b6e…

MALICIOUS

PDF

98.9 KB Created: 2021-06-26 05:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f52d43b4340e25fddaf57f646cf8e7e SHA-1: 246c6e7adad8811d6f08ba8bd5aacf0076e44b92 SHA-256: 53b7688a52e35b6e4b04581094e638727e382351b11cbe176a9bb1bbfa1e6597
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The document body is unreadable, but the presence of multiple distinct hosts and link farm characteristics strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608298a2e94a0---32945521251.pdf In PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/dcbfffc01ae5405c1a2eef6fafac3473/vekiriworexika.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fa64a08367ed0067c87d2709c12278b8/zutoweset.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/64659438248.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e153ab90b0---zeronoxelinafipofetel.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/48127392191.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/2799bd510593da68f137ad00dbac5843/rizovaw.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/3b18e85a96e6e3614308c4fa02412683/1852169503.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/01be30872adf7c905c1095d3d0e59bb3/pajiweziwisepumiwumuw.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/43170431919.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c66bdd24c918b3cfbc3b41a1a1a2c7e6/23722893726.pdfIn PDF document text
    • http://beateromer.com/bilder/file/79359614174.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/icjock0u6hsot4t4lne31icvbf/67236968130.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b764002e9e---30005902202.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a255809c62c---28685153028.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-30/20210430103720495331.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/80236701710.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d928187d7f---65043520395.pdfIn PDF document text
    • https://tmtteks.com/files/zibelafegenom.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/18002236493.pdfIn PDF document text
    • http://arslanemlak.come/file/25987186878.pdfIn PDF document text
    • https://unosms.us/userfiles/file/pirafonozukorolof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=all+cotton+fabricPDF 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_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 19704 bytes
SHA-256: 641c0fd021d8b88448ddd5b5bbaa03e6bdf0b0724f622c5c12df96411041b468
font_01_sfnt_off00014e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E52 10148 bytes
SHA-256: 25030cd960eb452efc3875b0c271c27ba9db42cf8b7545b16e0c508410eea4c3
font_02_sfnt_off00016524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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