Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37391a3f97facf5…

MALICIOUS

PDF

94.7 KB Created: 2021-09-21 14:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29a61a62261c9cd3fcaee2394a53eb32 SHA-1: d98de34e8c26e0d372998d45157107c3220d34f7 SHA-256: d37391a3f97facf5e3674ee6c42490a9c00a277400a3c9747c19103d60fad937
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. The document also features a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://nomylo.ru/uplcv?utm_term=adobe+lightroom+premium+apk+with+presets PDF link annotation
    • http://servicedental.it/userfiles/files/robid.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/57063285829.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/batodevaregewow.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210920145440.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149b232c569d---30373619089.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614763003f164---xifexusejazifadimuf.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/jojabokolurise.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/ruxelofekirunekosiruzu.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/54246140464.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec1bfd5dc1---tawibunejojuxepura.pdfIn PDF document text
    • http://e-hematologica.com/users/file/68685892233.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/xajowijexadaxerikopul.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/nizigave.pdfIn PDF document text
    • https://combrooncom.com/contents/files/xirixu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/87322065501.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/jiruzojuxepejebaridegugo.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/wexigupelebi.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/bamapivijurodedofekim.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/jiferokunokulurozu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8db29fc9cfa2a8717c7e94eae08801de/49395884062.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/44822963382.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/94614798227.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/1035443733.pdfIn PDF document text
    • http://amandamaitland.com/images/file/35676304705.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/62209442795.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_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 11136 bytes
SHA-256: 73b75e0fc7725a892172f89311352a6fa2170fb7c0c984a6d79241d02bdcaf89
font_01_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 22900 bytes
SHA-256: 8b1278799f596b678231df6fd3303762de0e2bca32b16ffd55b5cfefb08962a8
font_02_sfnt_off00013f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15747 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137

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