Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4f6a2d8a1bb32d…

MALICIOUS

PDF

75.0 KB Created: 2021-09-10 18:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 229d4152760a0602e54a0ee851bbb859 SHA-1: 43382728c1488cf962e45b6f27f361728360e929 SHA-256: 2f4f6a2d8a1bb32dc895554d80109eb94282083a1220864dbc70217043cbe499
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, embedding numerous URLs that point to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URI links and link farm indicators strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=queen+of+the+heart+movie+online PDF link annotation
    • https://clicksnepal.grnca.org/img/files/files/wokagogelodajudokiva.pdfIn PDF document text
    • https://carlojans.com/cms/file/20764745343.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/17702545350.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/tavul.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/gowujenu.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/93433077640.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/35409688071.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/xinojezakobosuv.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/zewosegimob.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/penazutijusenoxoje.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/nipamifutivatakubipu.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/50924743913.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/kujebavidevax.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/55903840299.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/e7742feaa6ceb4451a2022bf46af2b94/83552007374.pdfIn PDF document text
    • http://iucecb.com/files/file/1408907440.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/niwus.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/vakuxadal.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/diwopuxunukekuzigolefadu.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/faxuxagawadebu.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/tibedojapewuvatawimuf.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139de95a713e---91875182599.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bad8cfe91---30443847878.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/dixilaronegoxotova.pdfIn PDF document text
    • https://korankertas.com/contents/files/desererisudewijetabukawa.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_off0000c065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 17848 bytes
SHA-256: 71a7717ce413533551a0f374955dfbcbe6698cb4e394df14f56447662435bb3c
font_02_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 10536 bytes
SHA-256: 10c09c7f178d6041d207202b472ed1a35cef58c6d1f2a681e259ada6bb047acf

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