Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d61083c5c2266a…

MALICIOUS

PDF

85.7 KB Created: 2021-07-02 05:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0971277a77421396a4c67522b77dd79c SHA-1: a3b8b6226a7f0a268ba0c03009cf46326409078c SHA-256: 67d61083c5c2266a3c98cd4174ce63375b166dce9525a8f283aaba3917bda48a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites, likely serving as a distribution point for further malicious activity. The presence of these links suggests an attempt to lure users to malicious content or phishing pages.

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 https://ketchas.ru/uplcv?utm_term=morning+and+evening+zikr PDF link annotation
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/aba2ec9f09bfc6497f4f4779d3100a2c/50371527506.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/48574075277.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a20f44eb9692566ccfed7f283ad30f9d/rufaxuvikalomupobedum.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/df035743f8f8a4afbfc556f9d4a7a71b/jarugofajik.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160926bb767793---kovep.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/98191749938.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/d7cc5b6b1b5b412ef1d7b6987130b110/31729400371.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ip4bnaa3r1oa71m0v92epu9912/38528965316.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606caf7c7db5a---zogavopixazo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36b11ee7d0---50119208832.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/63855714620.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbda3a7f53---zudesiporiforalovimulatod.pdfIn PDF document text
    • https://artbynela.com/uploads/file/54595617133.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/47852453616.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/84898081213.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd256129877---22651871908.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5d8daa205b92857820b798603a4827d1/30575784649.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/38363947432.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/906db25faaa3aa32bbce24a07c307471/96889483724.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8511c07956---vetaxi.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/46350713245.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0f5dd48ab---rewowuzexemifezutav.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-2/20210702071557399020.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/mamekagakidogaf.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_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 17296 bytes
SHA-256: b9c1079cf58cfb69a180dfe7f748fb92fdceb0373d06fdb33970dadda8ac3934
font_01_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001325c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325C 10324 bytes
SHA-256: 657dad53e8d230db343d43410d5ec1f26bd6e47de44a057fbd78ec8b7649c819

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