Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cb47f12cc346a3…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 06:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c17db88987f7b183622132b957b88672 SHA-1: d171d525d3724a9dac7194b5ce4a2d19adaa09cc SHA-256: 53cb47f12cc346a32bab2dff845691b3471449d42c1f15f3dc01589a77da7c85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs likely serve as lures to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions, and the overall structure suggests an attempt to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://irlanc.ru/uplcv?utm_term=our+father+prayer+what+verse PDF link annotation
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d96bc88a3---gikobowofepixadas.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0c5e3ea7dd78a6dc9fbd7e7a2ccb6be1/57322663177.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aadcc0256---22523319458.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/20651114154.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/32969412581.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078e840b485b---woragaberovi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe0304c4f---pidexufakidawejeki.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3dd292b706d3a913de1ef4a5ae544bc2/nesepopimawojemajogin.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160cda87d5ebe0---6487943397.pdfIn PDF document text
    • http://heizler.hu/files/file/wewufiwafalujodifoniji.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/makokopusow.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c98c7ce44683f63d99e2d22ba44de2f9/xemuresuweto.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/21514519807.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xafazojuz.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210509161623.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/b67bf589d18421180474649acbf10060/birisatarolekoxepaji.pdfIn PDF document text
    • https://medtek.vn/storage/file/fasivedabamanewubunapa.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160929e486db66---30323192972.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/89056394367.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608e03c41492e---menilubalisirowag.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b8ae61e95ec8ab1c4c96b964d11a6387/59683651685.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8ec064f8ed00ce2af9a8195bff85fb93/97955103230.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/22996587049.pdfIn PDF document text
    • https://teyadegitimvideo.com/calisma2/files/uploads/zagivajisenito.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5cf0ccad60f8b16928cf134fc59090fb/suxesuxig.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_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 10484 bytes
SHA-256: 7a05af1c7c2b74226377e0ae72a6ad178dffe6a99e625594781c02e6139c0f51
font_01_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 17288 bytes
SHA-256: 328617642e60db59e8eb3122cc49a4b72d27757c4d2e9b1a2fe0c6136d0939ec
font_02_sfnt_off00013dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1