Malicious PDF — malware analysis report

Static analysis result for SHA-256 f011ca8072218b5b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 11:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ffb35350cf6e7d66a88fea7a1d4dd91a SHA-1: 53153d6dd2bca9fa13aea38f93df1db2bcbec616 SHA-256: f011ca8072218b5b9c58f7e94ac65331db3cc4fd68a3e0d09ba46d298e4a19b1
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://peter-scherer.de/userfiles/file/54520444391.pdf In PDF document text
    • http://heimundsicherheit.de/userfiles/file/kujofejogukapumowofave.pdfIn PDF document text
    • http://halanmilk.com/upload/files/zasadota.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8c905bf00df6b7124bafb96b904a4e64/13536478444.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/sovatelizawigosawa.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/tekesimuvafe.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/40184636238.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/82421480017.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f223b818---34494775521.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/lixapewotesujafo.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/vukilinanafota.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/sedezidadiropegukare.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/mesikebabesoxiz.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/70789472312.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6476d523---74547995739.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/sowimitev.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/lolujogizererubuzidimep.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/luloxasisowawevu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614024963b3ff---45310750645.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210906_100142.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/77931386362.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/gagimepekisume.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/vomikepox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=australian+casino+no+deposit+bonus+2018PDF 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_off0000ce4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4F 17636 bytes
SHA-256: ab409263778e4d0bedc657ca03b4c58eecffb58d7361599daec4f4f54f9607ac
font_01_sfnt_off0000fc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 11228 bytes
SHA-256: 0218cd86fb2a222d15f73775139688732fad576eb0c27da327afc97562be83fd