Malicious PDF — malware analysis report

Static analysis result for SHA-256 f381205a46d25ac3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 12:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4511473102d1bab4c84ab6e4505f4e44 SHA-1: 93bbec9f67a95871cbec87d82010a23a186d607d SHA-256: f381205a46d25ac3f5ba088e4764c5e8e572661f129279dc26574b14c987c4f7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://coretry.ru/uplcv?utm_term=architectural+company+portfolio+pdf PDF link annotation
    • http://grupopiscis.com/upload/files/42972323093.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/zemawemedoduwoxusuviwu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609836e6a056e---pabuko.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f08621feaf05e428aad72c630dff82cf/71770014217.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/82696242072.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/tho0898a4eocrharu9lqpshcs7/lomusixuwuwotinagor.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/6446758807.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c7ce38f2---zovavororatud.pdfIn PDF document text
    • http://tavio.su/files/file/winoleb.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/25915902354.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/koxalum.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/bikuduladawotawi.pdfIn PDF document text
    • http://dsfly.com/uploads/files/38952677370.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/36927412559.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/bawogokeme.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/jafizenekufi.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa7076affb---36361258230.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2bb96e39ca45e4cb16f84aa627aa5e97/bemako.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16119861d0061a---39874735089.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/nozumavuliwavumusufabog.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0a3332b2b7f5af9458455c4c9b07591f/monuwujotonenur.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610edc6b4a459---15181241942.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/84537542481.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_off0000c933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC933 16000 bytes
SHA-256: e340aca0287251dc4e8eeab4974692739cb2b36e2cf888a339475c50a95d8d78
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 10912 bytes
SHA-256: e512ff9dcf5629de0a6eebcbf8a9a54619867c7b2ccce4156468e94e0475041e