Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b34b9755065c65…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 09:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72cbf52d628efaae9bb48d6f039d0c0b SHA-1: 9b491a7dc6cf80b8165033bb341e8f280c1296a7 SHA-256: 64b34b9755065c6575aaf8fdaab3f344a3151774588e4ae398ce5ca40103d331
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=ets2+mobile+apk+download', likely serve as lures for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=ets2+mobile+apk+download PDF link annotation
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/kefopevigelofolez.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161455ca94fda3---nofuzapexabafugovajuxi.pdfIn PDF document text
    • http://yuli-china.ru/d/files/danilug.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/77c96a12dc01b268911cfa5e6b8b05d1/volubamezad.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/fezadokivokakudo.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a2e98feb7da2f92a98885dcd150b43d0/nazojolo.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/57012439227.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/32347440149.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/38011596533.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/99499514400.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/14457697903.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rcpqc6ljiohjng7pfuk47e3tmq/mivotosatizipakurul.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109051850057064.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/vuzimagolusav.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/xirebalikarogalixu.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/23256090967.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/533220928.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/45279288508.pdfIn PDF document text
    • http://samtekelektrik.com/files/45347590280.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/zegemodovoliwizoziwawax.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5df505c28---57143176998.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/daxobun.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_off0000d65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65F 18744 bytes
SHA-256: 84c29f63d75b83903f06d47ba721fa49fb592c00edefd4f7b54cbceffeb2e755
font_01_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 10876 bytes
SHA-256: 7fcc6f1109a68ca5b9d3de156b4c642205f1eb935082a5a69c8fbf710c2c8e07
font_02_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1