Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b0cab055564699…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 16:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b9ca93e9c554b56802a9506bfbdc85a5 SHA-1: d1bf7f8ee652607c6e2f82a465bc0b21e09d58fc SHA-256: b4b0cab055564699de4fa5a605ddee6a86a8961d3dd95e5d184a2dfac0a2cbec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://krisoc.ru/uplcv?utm_term=tspsc+group+4+syllabus+pdf+in+telugu PDF link annotation
    • http://toyotarenta.net/FileData/ckfinder/files/20210808_D095517121049CED.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/14026659619.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9ae682dbd---59733025663.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/68135077174.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/remizebefunagateniwusar.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/dorufavunuwatanedowom.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/pozilap.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073e8e8a551b---2243895830.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/81909320247.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/67484177536.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/14ef2a1f9c7756c6e80a2f921e7918fd/lifiper.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pb90ioal9hr5rv9rppmj2fgfp9/211793007.pdfIn PDF document text
    • http://alptw.com/images/files/titixogofu.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/tebexux.pdfIn PDF document text
    • http://lachina.cn/upload/file/2140202072.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/nejipogovi.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/kizujunasiw.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/57807367885.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/88025953786.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4722835ed---kuduwobesudu.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/vimogugabiruna.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c6e529b09---32362481333.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/28665762299.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8d847265413a0a39692fc8e741c3b6f1/fewojotupotutozumavutiw.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_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 18488 bytes
SHA-256: 4ff0a329cef4ea1075022060d762c0436e2d96a4c0948aa7312dae1556da98e9
font_01_sfnt_off000114ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D03 11188 bytes
SHA-256: 1799883f5e86a36e996b8e94e2ae1ef0c993defe32548f3bd7c1a398184f95ae

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