Malicious PDF — malware analysis report

Static analysis result for SHA-256 5805b5d26934f657…

MALICIOUS

PDF

82.4 KB Created: 2021-07-06 02:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cf4db92fe16cd1276f3e1e8a2a08cf48 SHA-1: d38cdf39e76dd9e2f1e2ef8b9fedac2befac7e93 SHA-256: 5805b5d26934f657f9410ff85778ac98f08e652ab1819336e28c69caf52ee14b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external links and the overall heuristic profile suggest a malicious document intended to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=it%27s+going+down+in+yelling+timber PDF link annotation
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d417f2c005f49b2123ff217ed1250aa7/gutarosixilifutova.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/3r4mimj8bl3qhrgktr08dlohr9/pogutapa.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/25300655154.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078ebb49cd35---63566562149.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c23a235cb3f7a5482c4dfa77708ca352/detemunoz.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9d9f945dce03d33bd7ede78fef3956cd/43789298934.pdfIn PDF document text
    • http://novichiha.ru/pic/file/tolurabevuluvovusojolakob.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/fe9u73npdvvrusga7vvanaspb4/kiwivoja.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/16801496800.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096206a99cb3---90304352065.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/40305862c74cf6827c733e241f95d928/12416264122.pdfIn PDF document text
    • https://premium-house.uz/images/file/92599062987.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/482e322886084bf1fa493ca1a77f459f/dagemetanitafudefok.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/winoviw.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b46a529eff---kejaxevujudirerewosepu.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e39a4df3---polijasugukekukatoxad.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/65243408813.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/tokadetuzune.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607de77a75db1---13635211760.pdfIn PDF document text
    • http://vejwun.cz/images/vuvavebomerazowagawub.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd892ec125b---63283198209.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/82742882148.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/44112215827.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_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 10756 bytes
SHA-256: 51982d04ebe5f68b3e87c8b6b7389b889c0f0a76fe864116d1855dc0d1391fae
font_01_sfnt_off0000f4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 18576 bytes
SHA-256: c4a2d45e28ece4e7043138205974d5ff4ab8e3ce9248e48ddb34f2de8b543d8b
font_02_sfnt_off0001246f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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