Malicious PDF — malware analysis report

Static analysis result for SHA-256 737a0167e5ce00b7…

MALICIOUS

PDF

90.9 KB Created: 2021-10-12 10:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0d5e61b537cd4d2edd52dcd3771f7195 SHA-1: f326c53a6d6b0c9a8dbb612fbbd699954727311e SHA-256: 737a0167e5ce00b79763281a7a430c9a0effddcfca71dd41570de3b03c4d2bd2
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to phishing sites or exploit kits. The embedded JavaScript is likely used to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://ontozescentrum.hu/tmp/5556870258.pdf In PDF document text
    • http://nemochem.cn/upload/files/zosusekutomudozunurolur.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/59709653539.pdfIn PDF document text
    • https://keongracun.org/contents/files/48518845213.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/65796926638.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/wolipevabovod.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/webobizezafavudezobulo.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acd9e812ba---pixibasikawexiw.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/xavir.pdfIn PDF document text
    • https://latework.cz/soubory/buzabotodaxedoxuz.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/ralokijivamavigibope.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/99666358150.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/60168161808.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210916002322.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/37ea416718ebf5f0f4e47d37cc803591/20933447989.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/detarogesaxukijetamo.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/rewavu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbbf9c61dc---14367184696.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/43634996598.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/xigisuzepota.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/tutopo.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/65634071014.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/bixumeg.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/jakotigono.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/nuxedokumawisomopodu.pdfIn PDF document text
    • http://unsersohn.com/images/file/13734790433.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=eve+online+empiresPDF 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_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 19988 bytes
SHA-256: da031770e75ca5009f3259fc21a8e480200e4545cc13ca19cc591dfab3f8d2d1
font_01_sfnt_off00012f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6A 10200 bytes
SHA-256: f61698dae2d98a44d5af490e666af6f7fa488608b1cde7dd820ade46137ee1ee
font_02_sfnt_off0001462f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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