Malicious PDF — malware analysis report

Static analysis result for SHA-256 f785120dc515223f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 22:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c459ad901c879a53a2f7aeb35f886edc SHA-1: 2176e6644cdbf9cc900e89a54094144246f7cf46 SHA-256: f785120dc515223f73ec32aab4d936b7fa3a6ac1dfcaca850f0efaffe8001601
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics strongly suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cructi.ru/uplcv?utm_term=coronary+steal+syndrome PDF link annotation
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161050bfb02517---jexuboxogubasudasiragopef.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/66633331224.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/82030220577.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe409bf292---61480162733.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/av5oeulv1pcqcga5sqq9rq26q9/nuxulusir.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/fenujijukixona.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/29435823229.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/nuwiwidi.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086a5632447b---sawedoredugofagafok.pdfIn PDF document text
    • http://jar-ted.pl/file/50749297920.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/nidufosolazugefo.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/17062841376.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/wazidalafoxexi.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/70908618608.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c1a216e3---82511364509.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/jowefe.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27052ed9f---55957877113.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/36588263236.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/dadae6e39062aa41d231b1b29ec5fded/8173768387.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/disudaperukolosafezewewix.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079741f4fb5e---19398900123.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ab31d0d49---kuwopawisidatutowajaj.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_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 10464 bytes
SHA-256: 44ff3256197563c99f36f0e1bb945f3763e9ffcdc73057422aa120ff770bd2e5
font_01_sfnt_off0000f7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 17240 bytes
SHA-256: 5c11b45ae9ad0fd4d7d8bd7f42dd5550d89cbcc479310fe7b05d2e1843b90ec5
font_02_sfnt_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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