Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed38d9382e4fb997…

MALICIOUS

PDF

84.2 KB Created: 2021-10-13 19:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 71c7117e45abe3b19f3e18c96aa3eb14 SHA-1: 4c4b2002bd3c981ad4ccd77db24ed0002f4bbd2a SHA-256: ed38d9382e4fb9971c8b67f886dac8971d6582acb0adfaa2ece596ebffd674f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/faf2a519a76571e43d5d3e0bec06180c/68106786326.pdf In PDF document text
    • http://baove24h.info/upload/files/19460927936.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/vegibuxovivu.pdfIn PDF document text
    • http://levotst.com/uploads/files/92627378989.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/62190134968.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/97808599935.pdfIn PDF document text
    • http://email-database.info/userfiles/file/67506398809.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2a65a189b---15671774339.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/gajovisigipuzuxejaw.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/26318562586.pdfIn PDF document text
    • http://jcsh.bluezp.com/ckfinder/userfiles/files/dujajewevoxakewifik.pdfIn PDF document text
    • https://taitaosuckhoe.com/uploads/files/juvogapatabudezifaxav.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/6c1821e37e940389b7384d8bdea97996/84373893175.pdfIn PDF document text
    • https://extrapaintball.wioskaindian.pl/userfiles/file/sodon.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/fumotokezul.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/65170469680.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16158af83ccd45---bilopafazinozag.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/gotalutojifumolusebum.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/mokap.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/82576949278.pdfIn PDF document text
    • http://fruitvita.com/files/files/7195204224.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=physiology+of+the+human+bodyPDF 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_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 19220 bytes
SHA-256: f59b47209dd26ef800553f0be8d9fd1eaff7d80b19a9850cb5636fa6194641b9
font_02_sfnt_off000129f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F3 11056 bytes
SHA-256: 06901515e5ac2eda4fe6ad333b384e5604b6696a02b2dcd51aed9a4b29c249f6