Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef82b5939cef1c65…

MALICIOUS

PDF

70.3 KB Created: 2021-09-02 15:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 364e1984ed1b1514282b37a6f7302825 SHA-1: 8b374f148908fd653666d13c47bb766eee13829f SHA-256: ef82b5939cef1c656060b94dc633da5bd70a3db9a7656a0bd60f8c4268ace180
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content, likely as a first stage of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8834cb671---pimikele.pdf In PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/bewipevavo.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/75363494147.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/4b7a5612adb3dd8abf5e9e2175ca0afb/pilele.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/gu0o8pkl3d1oippgn7pi0m5b64/buxeputanegenetegabujanat.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/satik.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/7160427848.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/tuwubopojujaderal.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8a780368a---93756715070.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/adc052f23713fbc015a4c76c85c30f01/mufezupiberugem.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b8d536095b---junidafoniwukewub.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/16203167406.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d4a694fb11d04eab537661c8e082e61/rizopofiv.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ai53nt9qmm6q0i8bq2no3tu6o1/84036569558.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/92150071556.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/semovopavesoludabizafivu.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/96695895648.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3d44e08d2---45040756757.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/zevixodezatugaki.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5902507702---silekeviwonovev.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/37103230164.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/riwarurefozesi.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/dutogudi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/kcnerlnj8behma5jh8uebhokg1/45369851558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=testbook+monthly+current+affairs+pdf+november+2019PDF 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_off0000b3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC5 11820 bytes
SHA-256: 3f4e17ed739daad29f53d49fce4169fba16f8f83eac5285e218fd38784c4cb1d
font_02_sfnt_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 14440 bytes
SHA-256: 206fc3fb914577ceff3b829e974b757aff0fa616058066b35dc8b858e372a120

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