Malicious PDF — malware analysis report

Static analysis result for SHA-256 b257ca27b47d05b6…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 11:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c7187ac64a703470651ab09c26167d88 SHA-1: 57d73e08e531471fbd695482d0d67adcccb76a6e SHA-256: b257ca27b47d05b60c0542bdec16e952c7ebcbae85b3f158e879a1385875d812
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The embedded links likely serve as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://ketchas.ru/uplcv?utm_term=fisiopatologia+anemia+de+celulas+falciformes+pdf PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5b8b40f7906e266949abf156df277144/35649666497.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b4486affd9c0220f0bb8bdb663ff18bc/pizaxufisodozux.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e9b4b8440---jesevidox.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/72472757214.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/74299167241.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/16852213721.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bebf271f1---polarejuk.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/10ad038c8d46984c08e649ced92e4f02/10394638406.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/24145947611.pdfIn PDF document text
    • http://newo.ru/files/files/63161859821.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d5c200b5736dbfe7e7a4a42d726f8918/10001446893.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14cc2a374---48361199111.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/74998338858.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/gomovokikolokeg.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/kixatokokozaso.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607beca6d78dc---neliriw.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d8e7e5b2f422b585d28fda87bfd28950/dolikemulufixovalulabu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4e70177b---zesolelidema.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/vitorunomij.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/romasu.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/radonelutagoxitikobu.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/gatokabuzadimegexixaturu.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/61999155046.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/46055762006.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bemunufuju.pdfIn PDF document text
    • https://medlineplus.gov/spanish/sicklecellisease.htmlIn 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_off0000c903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 11040 bytes
SHA-256: f5ca8d41253f02a2b79683b6bbf6e1ea663a276e04baf70e10e11d78996cfd83
font_02_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 17232 bytes
SHA-256: 28f7d3ffb4cb7bc755b51165421f42133005c6fad8febd6ee3716ea6fc87f5a4

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