Malicious PDF — malware analysis report

Static analysis result for SHA-256 7840272ffcf2deb1…

MALICIOUS

PDF

122.3 KB Created: 2021-06-25 05:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 83e022f841c6a00e4e7c680ed0c39de0 SHA-1: 81629d4b1f680c7e575a19354f2eece8a0b78dc5 SHA-256: 7840272ffcf2deb1ccb6317729cfe6ef569a423b24c5d3db95b26a85e8e85c4b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites. The embedded URLs and the document's structure suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846f3d4fc66---gewukopeburap.pdf In PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/7qqrgs632leqp0vthboi65kfmv/rijagud.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/wogiterugemelomabuvo.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/kowofup.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7862c08c71---31449294947.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/p011l8150cbpm3uldi54j3i1on/85273833444.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/cojsdjfqml98uh2pcb0tihrglr/28503660275.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/27876903831.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/04c27e7d99ef463ad130dfa2517ad5e4.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/72178621070.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/17272504203.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/jodesaram.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8c721c722e3fac41c25c873c775977d6/jalinivuwiwe.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ec99c466d---fodabumademiparezel.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b204fe0b0a02943d913fd3f6d12834eb/65929651925.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607232356b59f---xutavopujit.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/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=shingeki+no+kyojin+season+4+englishPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13311 35812 bytes
SHA-256: b5fc98e507259a0dc982afd8ad095b09371d271e35b535e38725b70dd971562d
font_01_sfnt_off0001a315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A315 5284 bytes
SHA-256: b4d01999c9690e558753146f37e162bf164aacfa1bcf5160115fdf80a414f557
font_02_sfnt_off0001b525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B525 11492 bytes
SHA-256: 0c08a1b43072bd6ed672864967f2ba32dd326b622efc6613b5f724d72dfeee17