Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab20d30264a6a100…

MALICIOUS

PDF

85.2 KB Created: 2021-06-20 04:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 06f8f724b451430b9b81d19181f8b512 SHA-1: 80943b0d3fe46e90ee11e26325d6f54e3c2c5825 SHA-256: ab20d30264a6a1003088259ef9999b01e870b5f7a6cae625abbd8713be9db9ed
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress upload storage. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise.

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 https://mvpartners.be/images/uploadedimages/file/35246514619.pdf In PDF document text
    • http://briarcliff68.com/clients/71184/File/jirilerepokurinawukijog.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/datudes.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/likomoxupupixebokopew.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c886c8177f---25073359010.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/71273583302.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/12079639921.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/xinotuzepigejifetoka.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8ef26f735204c4bbfd9258d6cb78e588/42181244538.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7a65facb885cd7e6470e290a85859a92/35077166218.pdfIn PDF document text
    • http://aven.su/userfiles/file/rifegidame.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/u7obeu5f0t56toud2guoccbv0k/23464151925.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5dql20rmaf6fufqu1uc5qil0k7/guzokemogodudimibofojifu.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/nuvorowerukopon.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609075138ae1f---vikerisapadoxetenilan.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/j84v2hltnpoqqftkt5mcuej8fd/69441745136.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f8458b12da99dc3ef8a1dd22c7e92ae8/8116551062.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/BkSY9tpko7c/uplcv?utm_term=key+lime+pie+no+eggsPDF 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
    • 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_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 4904 bytes
SHA-256: 0fa82e8d9c011428fc4ec1e1bcaa15861bd9cb20821f7ccd62344be84744ff3a
font_01_sfnt_off00010833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 12108 bytes
SHA-256: abdfd9b2f566a86faf72b6c950fb898b3a496671cb9592d6dcf585827a97371f
font_02_sfnt_off0001314e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314E 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073