Malicious PDF — malware analysis report

Static analysis result for SHA-256 149a318651f2bd5f…

MALICIOUS

PDF

76.6 KB Created: 2021-09-17 08:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c19513b52e1c759d99c5301c265c820 SHA-1: b4726f5d3f0831a361f6fc727718835787282490 SHA-256: 149a318651f2bd5f5552ec2eebb3da5bc394ef36d7b79b05d8bb1876c9cc9dd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Numerous heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=mu+origin+download PDF link annotation
    • https://rmp-traueranzeigen.de/cms/files/tirinabinumedurajirebodi.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/69508250038.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/surepasaxamemafesuk.pdfIn PDF document text
    • http://vlajamo.cz/images/file/xumesanukivew.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/nitexufokuzudobifokod.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/dikisepubiwisokabax.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/tanumejiwe.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/rejixelamofu.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/lodovugedusi.pdfIn PDF document text
    • https://ferropula.hr/files/femifitapupesupenivasowi.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/ruvonixokobupikanobo.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/18811450687.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067e6626eb---fifij.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9f672e5f68c6bc7844d99acc4833fc18/gamurisupus.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/fibakotalawewevaro.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e3e6a2e6---lijokixorelavidugokek.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/xopivobujomotobutoj.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/58956569846.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/xetisaxiv.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/6055161327.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e801450fce---17945909438.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/puweforogapefejitibot.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/tinasaduba.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_off0000c544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 18876 bytes
SHA-256: 87b3aed3a1d026ed0795da18220e4bf5acb321c93ea8f5a472060982752a9a2b
font_02_sfnt_off00010ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA4 10204 bytes
SHA-256: d8f1784aef9a47df2850de24d6972f0ff3f8abe1881be44faf2197cc3e22e0a2