Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e2381266e2cf3d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-21 15:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c3236f08b973323e6e61d23734de9b4 SHA-1: 054529fba0e2442c08e5f4d0938edd837523b5d3 SHA-256: 19e2381266e2cf3d073a2dc6417bfd1fd96d86874c447f1bfe657f1e7dddbd84
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on domains flagged as link farms or potentially compromised CMS uploads, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://xyr59.com/filespath/files/20210903140321.pdf In PDF document text
    • http://toszegisuli.hu/userfiles/file/31637852649.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145ea1107fb0---zutasorawap.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/14116085421.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/76131202642.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/26615722669.pdfIn PDF document text
    • http://ge-mak.com/files/xenomanuxodavuvud.pdfIn PDF document text
    • https://csn-alliance.com/data/files/gipugeberos.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/53446814990.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ba6430b2c---somejuwemaw.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/petiverejapubunepijebog.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/09c749e165d4682a9a32a4818f06827a/sujavepema.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109060530518204.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/4735607ad6a50e80339a272c2c8ef672/bepogopoxegam.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/51882808835.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/bivijibulu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613576c8af3d6---fixozivu.pdfIn PDF document text
    • http://kco.su/userfiles/file/60625919761.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/38914957737.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/40502915781.pdfIn PDF document text
    • http://balalajka.nu/media/27039312704.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210906_0DCBE41B883A23CB.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=thermal+engineering+by+rs+khurmiPDF link annotation
    • 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_off0000c45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45E 17240 bytes
SHA-256: 2800002e2d1c524c06852e9a752657817a2dcc5e3c99762d00c26bdb4affe0f6
font_01_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 10744 bytes
SHA-256: 92d4a82c7ee04b60eb6c5b4f845977b02db27cafbe4a54655fb5d5c8d1116dc8

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