Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a6943bcfab1950…

MALICIOUS

PDF

75.8 KB Created: 2021-06-03 09:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 855e51110f5775f42daeefa9002800ed SHA-1: 421115535d03965a42f4a3daa17e96840cd3df98 SHA-256: 75a6943bcfab1950c19d3ac73a5ab20270d38353d296eb6cd0684b1398c15723
156 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ClamAV and an ML classifier, indicating a phishing and trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used for distributing further malicious content. The document body, though partially corrupted, contains a lure related to setting up a diffuser, likely to trick users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a93da59f78eb16369da79e755fbd92be/wurepasepakebel.pdf In PDF document text
    • http://www.sport-konyv.hu/userfiles/file/nerumabu.pdfIn PDF document text
    • http://edgecs.net/documents/5745700810.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/95251041025.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b459830746a---timiledujemivopixet.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/rj64na1q71dtig7fspjjfgb04u/vemelevavexuwugaf.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73636c44c---sedav.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abead20ffb---88688295772.pdfIn PDF document text
    • http://amandamaitland.com/images/file/84734428613.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/panokutukudoworaratal.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/dimidivojutudatumi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3f6d2dac8---xotos.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/javegap.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/ds33ub7b9v4nral95c3iqe8ule/kodipotosofison.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/35c7470b776c7aa3e48680d9c0e1e183/46482226814.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+set+up+asakuki+diffuserPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 5120 bytes
SHA-256: 0e673f37100b159d96e3a12ff6322813ef1c03552ef516e5c2ab631b40fae87f
font_01_sfnt_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 11636 bytes
SHA-256: f113f91ab7a6e64d38dac2268a25f31ba401881a97b110cb106a7852ccefd387

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