Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2c4d46c7d78630…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 19:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1daa40567534b65de879f5d2395515a1 SHA-1: 9e88270cde13169040cd282dc21b6eda3ac1d917 SHA-256: 5b2c4d46c7d786308f76a597313032bcda44eda7e9c74e3761a5d06ec2a2e57d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=free+offline+backgammon+game+download
    • http://huspanda.com/data/ckfinder/files/85615718182.pdf
    • http://xsjsbzrw.com/uploads/files/vexikaxe.pdf
    • http://asfalon.com/__files/file/bijilavewuxafe.pdf
    • https://elnativocoffee.com/silver/upload/files/xigesejaxotawalobilusi.pdf
    • https://meganimal.pt/site/upload/file/mewinika.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1aea3f377---53335507855.pdf
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60056800558.pdf
    • http://centonze-vini.com/userfiles/files/silawezu.pdf
    • https://jamisonfurnace.ca/userfiles/files/73963636592.pdf
    • http://steakclubhn.com/campannas/file/9377108096.pdf
    • https://lanegarrett.net/userfiles/file/levenevikomenok.pdf
    • http://avvocato-callegaro.it/public/file/7831472577.pdf
    • https://mytalk7.com/_UploadFile/Images/file/bikovi.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161309078bf4f6---92648800080.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307a0d56a0e---gebegoxalano.pdf
    • http://yangpupark.com/uploadfile/files/seliruwagigulug.pdf
    • https://md-bud.pl/szklo/photos/file/29807648537.pdf
    • http://xn--aknmedical-yub.com/uploads/file/56984979377.pdf
    • https://tlproduct.com/userfiles/file/18731433326.pdf
    • http://fresh-j.info/images/uploadedimages/file/61302768168.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/gixurefowobimulawenati.pdf
    • http://schokozentrale.de/idata/31734240994.pdf
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/bewizutaluwasimoluxolerel.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d6f883012115aa94fc09ecffad84aa4b/1906272300.pdf
    • https://deltarealestate-eg.com/userfiles/file/samonutumitetugogofovasej.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 16792 bytes
font_01_sfnt_off0000efe3.bin
d327f1d34aa3cc4957827ab24d2e5dd3ffae80ea4fe90ac0c529abefd177be20
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 10848 bytes
font_02_sfnt_off000108b2.bin
5ecaa4cf86c7da408fefdd64a42a3474ff3e078b17e61017c3e4cce195b7453f
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 17320 bytes