Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae90658e71e503f…

MALICIOUS

PDF

97.2 KB Created: 2021-08-19 03:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36c51574cae786ee74966c8772d4742e SHA-1: 13aa31bca2d742bcb7f3b15df36ad8082d73cea1 SHA-256: 7ae90658e71e503fa72c55dfe445eb0a30fc303c7f1320348d6c3fab8d98986f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting domains. These links are likely part of a phishing or malware distribution scheme, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://synerhu.ru/uplcv?utm_term=are+nightmares+a+sign+of+psychosis PDF link annotation
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/witujuvosilomazurof.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/74246720083.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608be39dd4057---71108727413.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/88158a32bc41ab928ab9b938bfdb3467/jovevajemo.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/pupijixufezitovafajorap.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c6c46d8212b81c0186f71e350ef6641a/89391610668.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/limimamatezatakifokate.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/44791735946.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/7469716356.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/gitifadanivisivipu.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/sakatuz.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/59d063f1dd64dfdf75d51201d1692e31/vopatujopipokifipan.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/98997997154.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/23892127388.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/94120886756.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/bapugopuzirax.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/lemivojasamipelorufudalep.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/repenakasezagofur.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/satit.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/73452962816.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84f3842391---47487234685.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/9d33246355ea4aaec651d2d10e4c70d8/fulijidisevakivi.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e246c1fb87---kunaduxigakogariseda.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/87sb5j9osiuhjjagll7d5lthen/lasegexeso.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_off00011611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E23 17456 bytes
SHA-256: c3ecd3e8dbe4135b2d74c37043d066f24c416918c29ff957f9dc07212473c023
font_02_sfnt_off00015b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B0C 10976 bytes
SHA-256: cb32db34b7d14f294515f33ba12d713052c7a22e957c28c7753297edb618ba62

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