Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c26965246bd5b0…

MALICIOUS

PDF

90.9 KB Created: 2021-09-06 19:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 839e90044bd588d23e5e7695b215fe35 SHA-1: e2ffc1fff8b78c41ba10248984220dff07f5a613 SHA-256: a4c26965246bd5b0c0e545178f7c89b6bd2728335f50a96c3bed0e22e8ab263c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or trick the user into downloading a secondary payload. The embedded JavaScript is likely responsible for initiating the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=nuance+pdf+converter+enterprise+download PDF link annotation
    • https://weeb.nu/userfiles/file/dinitirunib.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/jekikexezadon.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53916587917.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/52425102024.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/36284703737.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/60118461973.pdfIn PDF document text
    • https://people11people.com/uploads/File/11232404927.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8f9bb75b6f943aacbd2689ee86940a2c/47102063057.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/qhelehtmu5imne69oui2cu31t3/29523839954.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/magonikiw.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/33ck308ocbuchk229t542ikp30/rutunu.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/318991909.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/33561569274.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/vomolovi.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161034ee309686---62276766283.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/palekedotivikukewuboteki.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/11544597392.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/78067597971.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5eebed85832ab456e9ae1defd5f4c54b/detavaforutonuwifiredo.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7233d631094e87973fb551339f6109f0/54181192191.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/lijilexetefemoluvepos.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/mikijisijedagapiso.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/51472585296.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/feca43835978a99e630eb529e0c5e96f/bugitusofasavagewa.pdfIn PDF document text
    • http://expresskaliski.info/file/7010471237.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 19008 bytes
SHA-256: f8ae79c801ab7ccf4ae55ee4ab13427a229997fd0a57a7ce48242707d0e7c519
font_01_sfnt_off00012c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 10840 bytes
SHA-256: ab9907aa3c467fbcc8f31a763e77ce071e5b3b9f7f864bd3c1146f27d7ef8a2b
font_02_sfnt_off000145b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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