Malicious PDF — malware analysis report

Static analysis result for SHA-256 650e5a62cb68f277…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 06:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49b21f0940382fc2e6bf17004bcf202a SHA-1: 0d345321485420c059801c38b48817b58c3dd267 SHA-256: 650e5a62cb68f277d61e304d63ecbc5e46191b95f82b22a9d09d303164022ad4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drafthe.ru/uplcv?utm_term=speed+of+light+in+miles+per+hour+scientific+notation PDF link annotation
    • http://kimhoatra.com/upload/fckimagesfile/jusikozupefusugafilutu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/3fc2d3d1bfdf4b20755d16001e74e033/gafapuxuk.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/14897427722.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160831156df188---61178070787.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b4c6ac84d---wifawezozekim.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/gurebudewutawewarimib.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/bazal.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc6e283902---32367948336.pdfPDF link annotation
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a8e1ec587b6f88e0ba09e18fb39500cd/62180551427.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fba6dff54---79981348974.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/31938603272.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/dorujolafodilimakojawife.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ef77efb0c---63831127321.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/ronabaximifiwutizin.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/68f5aee06911ff80932c76d25f26ed72/64710874757.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/fc6b54b8fa0bdbe7838ff2236505739c/welezivudurud.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acefc55a4c7---92538119234.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/38183493204.pdfIn PDF document text
    • http://siembra.me/uploads/files/85802905991.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/18753902561.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607228175a917---xigozuzukizo.pdfIn PDF document text
    • https://x-software.cz/data/file/bekokapejuxusupu.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/nusiri.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/jekopubozovaterezutipulod.pdfIn PDF document text
    • 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_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 18480 bytes
SHA-256: 72e2b29647c904ec1c45d2fb0f64002542870931c3065c41b8f6f153bc8abc63
font_02_sfnt_off00012d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9D 11244 bytes
SHA-256: a632a6dd0240e73a78a7d6a3f00397ef831ad6ef0ff4aff1c169ab9ada41c4a6

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