Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc57a7ee7fd78610…

MALICIOUS

PDF

73.2 KB Created: 2021-07-13 18:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e7dbec6e91cd7f63dcdb034dc9427e20 SHA-1: 9496cde6f46322b22540ba11351ee55ab9abc26b SHA-256: cc57a7ee7fd78610880131f0c09e9dbd29a22e496e5ba992c621fb7d6aa5f427
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous links pointing to compromised WordPress uploads and disposable hosting suggests a link farm designed to redirect users to malicious sites, potentially for phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://taxicityplus.ru/userfiles/file/dularap.pdf In PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ad153cace5d762d1f50d780aa69a8a64/dopelatewusegisa.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b606fddb294---84243460311.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609bef5739490---480593598.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/nuratorofatazevojepuwe.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b88333b67---juvatazamopavozemoluwodip.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/311947102.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/0uhi7gpiq51m1153tpn66s684d/papolin.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d994a0894ccb64dd17c6e2e7aba2aff6/17084394740.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad2348555e---nipupimujawoxo.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/zobiviserulate.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/tbn9ornl7q72ijl0jbfaeh5ukf/sepakererinoxulowopusolu.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/41158048199.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/9868cc3a6ce6f118b64b339b62a18570/38436276902.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4574aa5b1a---dezaj.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac0ca4b45---jojokuf.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/9bec8e31436aba1f8d9f1972b15099b3/65174494652.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/c17fcd18649b908bfbf6344cbd622cd7/kanokoje.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b6d69ade6---17749600279.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8f377c12825025591f253e2fe263e42c/49336239235.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856122ea58c---vudap.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/1a329a6fbf9e7e2d7ae25614897c7390/54288030748.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/51e31855c203ad3f023abea8bd83116c/felof.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4297e08ee---pegigozumes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=faded+simple+piano+notesPDF 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_off0000bfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC4 15696 bytes
SHA-256: b3708661ff6eeddd9fae0293f21e2f31bb2669682c3ea01fc6a8c7ecd5912069
font_01_sfnt_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 10432 bytes
SHA-256: e2d7c497e59d4210d513073219869e18ff5a82bac7a7827a44e9b00b5f4223e5

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