Malicious PDF — malware analysis report

Static analysis result for SHA-256 494bf3bca3f4a6e0…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 13:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6df7ff687dad9d01d57d459d7d4d8e87 SHA-1: 8b1e8f4c21515b250cdd94e88e6679a0901a7b50 SHA-256: 494bf3bca3f4a6e07ed355e7f10a886600315259408afd2a37ddd8215f8af4f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/0057f3fe667ba44881a83093c5f8605d/89712683527.pdf In PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/vf8ns5nmh7fvbi8oipts54no85/22815060020.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/53394845197.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/zakibiruda.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/jukopo.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/81834091880.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9f7f84db458dffa077a1aaf072296738/zegar.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/bd534f22e223f4d3d05ea0fcb65a443a/ritupowusalifokiniveju.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/75450921186.pdfIn PDF document text
    • https://seerupit.dk/assens/file/83047877746.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/wiberodiz.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/7552008980.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/16239857341659154393.pdfIn PDF document text
    • http://chipgene.com/image/files/20210830_005543.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/nikegukeluzoved.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/rupetakuzixopabe.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/17451407307.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/24378837558.pdfIn PDF document text
    • http://alltechsro.cz/files/nofivapakogebazuxigigek.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/53204502862.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607045dd2a615---zoditewilimik.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/veluvadozupevotixopoxuva.pdfIn PDF document text
    • http://ps173queens.com/clients/10779/File/borapiwidaverujike.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/df5a540b3bf37a0ddb6ada0681664344/vuralawikenufimijifanonit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=edit+pdf+document+on+macPDF 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_off0000bb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD391 19348 bytes
SHA-256: 3082bf5577fd10904c967a0504f9c01afafe413dbf8f202044300d040f157e61
font_02_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 10548 bytes
SHA-256: 7293b2a30b6794212acbd6a3cca8358db67d303ad83596915f9274a79cf797fe

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