Malicious PDF — malware analysis report

Static analysis result for SHA-256 742ad7fb88f317c5…

MALICIOUS

PDF

86.8 KB Created: 2021-09-13 11:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 20852caae5f95e2e65a4c0334e30e85a SHA-1: a19d55ecccae240aceda0951fe207c1d34348772 SHA-256: 742ad7fb88f317c507647cac3baa679205f68aad544ba15608c4ac533e7ec351
196 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's intent to trick users into installing malicious software by masquerading as a required update or extension. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=monkey+omegle+app PDF link annotation
    • http://inwama4.vn/webroot/img/files/vuvixiretoloxoralu.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/tezarinope.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/gibugerivovemexer.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/novir.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee38c671f---berebelobaza.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/74432253119.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/12798323320.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/1127812139.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/xesepivazukewuvakelar.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/dubufemideniwazuloga.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130648751229---jaxexafanivegefu.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/67681052495.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/47860780832.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/46569929671.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca77244aee---jorupesitobunikawarupexul.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/48245983551.pdfIn PDF document text
    • http://carbontuning.ru/file/paxawezivefuvoxabof.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/kokukojefufe.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/94574897064.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/senanibajoxesexa.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4e35e84fc---pitabirokubudemakokovun.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/97979592955.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_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 18448 bytes
SHA-256: 9d34383471a780b2ad4ccbf23dd9baf740a21be088b3895a0ae03afa6bd6031c
font_01_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E2 10336 bytes
SHA-256: a073deb7ae072c02ac69dbed2fd60527d71aa5b2c47e1fcfa136a55a73fe9f06

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