Malicious PDF — malware analysis report

Static analysis result for SHA-256 faaed511bff51ce2…

MALICIOUS

PDF

88.4 KB Created: 2021-09-21 01:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3562d9a72db6fe4c275f94b9591233ea SHA-1: d59c028d14ecb2cfdff0e0588c68c76a2d63e5d8 SHA-256: faaed511bff51ce2707318ed98c26d844059dc9c7017fd3beea0aa86be279a72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using link farms for malicious purposes. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are probably used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=upload+pdf+file+using+retrofit+android+example PDF link annotation
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f62f71c942---nazosikimowowatitivafata.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/71044608454.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/96080362912.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/wubikanadoroxobedafemu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/8568ef3af3fc4f72695c99e612861905/1954194833.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb453dade8---vipeloxukituvexobebudar.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/zojuvegasirifezumirez.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/21785223522.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/vodiwijorevefitiseji.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/nupabaduzupejazaro.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/65712083229.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/zekolizudujasixesebofome.pdfIn PDF document text
    • https://semut73.com/contents/files/lopumizar.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414ce24e597---sixaledugofa.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fafaae9249---62917544227.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/zipatisixowifaxenuze.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/47356216794.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/94062317701.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/maviriter.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/jaxiso.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/paval.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/lulaxezore.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312adc43c0e---mazix.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 21600 bytes
SHA-256: 755c85f97048534ec3f6af2a6d4ee58512674920a38e2d9bbbe0305016591ab9
font_01_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001235d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 11048 bytes
SHA-256: 89e9cabd8850baed293fb33239af47a9463aa77f834423de049492f5c8bd8b68
font_03_sfnt_off00013cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDC 16348 bytes
SHA-256: eaecd8d8fd522c10bb6c38e7bcc7847058292b0b1d3079742b93441128788822

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