Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd1a7b67675cd7c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 17:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01f848d886347b29d5a90b15e5eb3748 SHA-1: a33220cba11c662244bf33415536bd1b92ab0cac SHA-256: bdd1a7b67675cd7c1ab76c16e80bafd8821590515bf387d13c745f1882a5a42e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing a detailed analysis of its specific lure, but the presence of multiple suspicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=how+to+encrypt+phone+calls+android PDF link annotation
    • https://evpersoneli.net/ev-personeli/file/sarusurotavoxusurux.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210901152353.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe9ca29158---vibixekem.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/11636807256.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/gunakapufawonuzuwajefig.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/47671926397.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf38d303b5---lazijuteko.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/24999048029.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/sifovoxijamokajogoki.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/tirobalokazisa.pdfIn PDF document text
    • http://dongphat.net/upload/files/sitenusoso.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/vikoxarozitebunori.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/76054058018.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210912202753_1091440477.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/28017687259.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/kawivibarinovum.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/81899754642.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/99276305268.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/tidupiwamez.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/45296039886.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/60485372046.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/7a175c38a7b227df12fc6841322335fe/mivuzaperotoraveruxadipo.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/39308329684.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/4locssk1g7vmvq35pmi5fjg821/81366166404.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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 17916 bytes
SHA-256: f7ed2529e96d92c01e636d5ffe2e987168696560c0944d26b546800127d88cb5
font_01_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 10804 bytes
SHA-256: e3d441b10ec525429b18218cf1caaaa14fdf863a4a244437a06ec1c0960b68a5
font_02_sfnt_off00012af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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