Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9af6a10cdae01f9…

MALICIOUS

PDF

74.0 KB Created: 2021-06-18 04:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6b2bb9f12bb2da4fe9e937e0ef30d531 SHA-1: 05bae5c5778552d6a6ab277e97f40f3194f669ab SHA-256: c9af6a10cdae01f9239c01254bceb47e382f5a3ecbaebb7cbeab77b7d1850802
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The structure suggests a link farm designed to obscure the ultimate destination of the user's click.

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://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2e228d7a59c8a3e0f7140cd0f84c16bc/69683277046.pdf In PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad2ad27f2---22827865061.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/148a11406cbd138cf7b85dd3774d37de/50003993928.pdfIn PDF document text
    • https://tepihtrava.rs//files/bewowurubowal.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/79094dc824dd0446c41b0c35552c9f90/senizi.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c657d093c1a---nonenuboponetuvivow.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/plh6id8gf2isu6jkcq40eseml3/zutog.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vifo9ke38ur1hb3h1330ptln12/gakovijomadakakegesubukab.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb9eb765a2---36583892510.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb240a32e8b---23037537275.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5019d09b58e0d4c64b00ca5d98597cf3/domewofuko.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73721e4949---bopegaloxuraduguzer.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/96161577190.pdfIn PDF document text
    • https://xistenze.com/files/files/65228578110.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/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+ash+grey+play+onlinePDF 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_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 5400 bytes
SHA-256: 019c482fb61af1d0d3bbd78d6d80845c0933f7755180499cc9184b47c68cccc8
font_01_sfnt_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 10728 bytes
SHA-256: 6f8ebbd71cfe471348a3ba82a06c68ecfcd0cf57d01acb08932113103fbb8fd6

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