Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed86ab51ae0e5a5…

MALICIOUS

PDF

66.9 KB Created: 2021-06-22 17:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 97759bf5264fcc73c438abbd91fe2afb SHA-1: 0d5f341859d9151247bb60d2bab49550688660ec SHA-256: 4ed86ab51ae0e5a52095938246c0ed404845ff2b79ae3fb4b4d4660424279f79
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 websites or disposable hosting, indicating a link farm designed for SEO manipulation and user redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/60431145839.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/dediziduvebe.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sapekutowifaxavisexiga.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/02738602c048174a20a763ac5c5d5de2/gigopisowekizuxanepixup.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2abd6b54---49617770355.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/difarivafi.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/f7ce1ceabe93910ff76e39b1716957b6/nilokamirid.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf208542ec---zewekax.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/54390135522.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/32999438112.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076a9b10aafe---solanixajanefevanezilak.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/75149101889.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5ob9r4bfbf81m2jvrqc39chmoq/75378319686.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e426d1f8f375761103f1c07c0d5fe48e/jesanulab.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a34be164f82e2eb3e28e0f2bc436e55e/25858525607.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/BvfzZFkJO3s/uplcv?utm_term=fundamental+of+engineering+thermodynamics+pdfPDF 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_off0000bb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB09 5628 bytes
SHA-256: a2cbb7273a03f71d7c720cdf4a034e450cd12690e82574146de93f6ed23900eb
font_01_sfnt_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 2920 bytes
SHA-256: 0b0b60f7ee493458466d2ab00f2b6d7b9e57c8a987d59773a0935645a7777da7
font_02_sfnt_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 10748 bytes
SHA-256: 66a3a1d0ceaa0649233b0c4adae28ad43a17e948c8c4f0f91610d2682d4c9a97