Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f492fe28514d9d5…

MALICIOUS

PDF

85.3 KB Created: 2021-08-26 14:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f5cd75e48b7c18af0831c3a45bf88943 SHA-1: 3c01e6d7665de59dbd87555b74339842a33a9ee7 SHA-256: 0f492fe28514d9d5b8749d3bb79375390abc7c8728ec0f600be58dbb873dc94f
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. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites. The presence of embedded URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest an attempt to distribute phishing content or malware through a network of disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=probability+of+3+person+having+same+birthday PDF link annotation
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/utv99s7s7f03gdeemf99207t07/46886192576.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/makinovuganowa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4qpgqno2tckqaekbnjgos8uhq1/11276656190.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/57877239130.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/61155936348.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/gekojepiwogagu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d081613f0---bebomumadodurinarifi.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/1596428739.pdfIn PDF document text
    • http://co-mit.com/uploads/files/pazexi.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/15236985208.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/91257861172.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7638815d4---2374729037.pdfIn PDF document text
    • https://kawanmto.net/contents//files/26761159009.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9590293fac---kobejojeripolilamofujazon.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/9494646920.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/55394511615.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3af03c4e5e43e1daa2938cd4ae3ca001/41224590143.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160873d65834b6---zazotuzuv.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/12817281316.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/40767557135.pdfIn PDF document text
    • http://eurekaloggers1970.com/clients/a/a4/a4917853023b9a70bc4506ca58f09c65/File/puxufoxufawarasaxugokipu.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_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 19408 bytes
SHA-256: 95eb2070e2f308cb73dacb3770c141a7e537cfd5d8a166c42c65f62e5419f064
font_02_sfnt_off00012a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0B 11440 bytes
SHA-256: a8674e80467efe013ae8153e15a370edd4bd56a5b5ce5e653eaa6310d963af48

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