Malicious PDF — malware analysis report

Static analysis result for SHA-256 96fdfc4df9c3acae…

MALICIOUS

PDF

87.8 KB Created: 2021-08-19 01:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be37a19edca2a3c94dc2c564de71f6e2 SHA-1: 833cdf88000d9d0a1bee6c95c30e3da4a7f82675 SHA-256: 96fdfc4df9c3acaeca48ad0f21642ba198c5a03393afe47ee621a71341d146c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://coretry.ru/uplcv?utm_term=descargar+geometry+dash+2.2+beta+apk PDF link annotation
    • http://alternatifmedikal.com/img/userfiles/files/69436386298.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/53216979852.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1o45n1uut773e5s6avur6v11j1/21069789272.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/dazibuwoliv.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/muxesozeganiwoba.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/judejumevubazos.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53a2908b8---86859552444.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075839134607---544024112.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/67721648266.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/rdopmbfqp8q0u4a4vsemb9qp3e/rujotozeselorap.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/375431c1f751f4a4854df3ff73e463ed/99877051107.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/87ce1cf2133b0c7e464930cfd9eeebb3/sowisejajudameresa.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160caa5c0ea086---42920493153.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/m0f0dk0rlkuitm2dd2k2krn6v1/73280233678.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/2bc9c011aab8dff9ed457dcbe3bfe403/47401100453.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/49631256e7fcc576b98664debc18b329/pavorumole.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/2ed272c7662030f1471b71259608c5c9/jupivenerusizekofelazeli.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e08594c466---65925885032.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/75231029713.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/12275138674.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16082a54e7f2f3---32605202397.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/bikubavavanu.pdfIn PDF document text
    • http://huntland.hu/upload/file/89546413112.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_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 17648 bytes
SHA-256: 53f2793db750c64bcbc42533cd97aa3e3fc9a8c2a65cf95a69b0d75e2ece57fa
font_01_sfnt_off00011e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13689 11252 bytes
SHA-256: 5ed23569de69e1aaa65975eb699f393b96373e949b9f898d98a6c067abe9eb6b

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