Malicious PDF — malware analysis report

Static analysis result for SHA-256 8545a6c17562649e…

MALICIOUS

PDF

78.7 KB Created: 2021-08-25 20:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 054629e29ed4ba88748d0c0c905b4a02 SHA-1: 1c9b340b81981a0cc6794404743e04b140908fa8 SHA-256: 8545a6c17562649ed4f3e59830033b46f03d72cd6d93d44479ef0bf5ea7cba77
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while some are benign, are part of a larger pattern of hosting links on potentially compromised or untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16109f59d3d98c---xezatugawamugabijotamagem.pdf In PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/75562196916.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/mps8saog5jfa0eo0cq39jrjgud/kebofelifutukiduvagus.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ntar23ci266v66e0rkc0a4do9u/gavajomim.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/25593810777.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/57639274247.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608980354cfa5---27065651024.pdfIn PDF document text
    • https://hiroyoung.com/data/files/kozivitoze.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609be9ff0a49f---niguromubiwuputalewob.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/af6f94a5a8310044262a752d3720385d/20602691101.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7222dfe56d29c91fe45c1a7b4b97cb95/28297193112.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0648170e---70926437385.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/44140768959.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608379ded3aaa---42858281105.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/182154124.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/defotinokefuvibis.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/82443412300.pdfIn PDF document text
    • https://chp-travel.ir/data/file/5551680609.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/50095379370.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/35980766315.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/22cd89f18195161d7038a47c9ce385ac/75414004494.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/7fd5111fdad078d104ab717cade87b30/nodofexisebabamami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=bugger+off+meaning+in+teluguPDF 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://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_off0000cf69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF69 10540 bytes
SHA-256: b664a89cf6f9af80d0fe1c47c65212ab9c4d102c60993df7089439dbe43788fb
font_01_sfnt_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 17400 bytes
SHA-256: 6e8253cd79e3b309a6ef61a336a5cab807cf46ade3da1ab31730b19a45ad4887
font_02_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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