Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e523628b69959b…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 05:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5271fc9186714d5993130bfedc7ea4fd SHA-1: 3f50e5d4c0d5219a455294cf33c6f0c58ceb9d2a SHA-256: 72e523628b69959b1a61f6e3f432cd7ba2eb649c321393e7d4e355a73c79d6b4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with numerous URLs pointing to other PDF files hosted on various domains. Several of these domains are flagged as potentially compromised or using disposable hosting, suggesting a tactic to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://rem-proekt.com/f/file/88513321769.pdf In PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/pobavog.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912230622639452.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/wofuduresigefaximibipevo.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/96851908416.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/wibezadepigaroxu.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/giwenenokaropokutarodi.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c7d726921---35238961327.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/boxatuwowuzadixoxizativip.pdfIn PDF document text
    • http://tcihk.com/userfiles/1386026276.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/51305022157.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/sapisuraro.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/36750050518.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/kipakesekaderasaziga.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b5e8758e4a6785776c2c90cfe3e367b8/75973093043.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/75534155638.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/n5o14o9d4ntjujpe70kl4p3ov7/9678135563.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/gomepesefa.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614af75a06871---pixokomadu.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/vakevurewe.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/32338096172.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/29879069034.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/87302289220.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436ec9c2a08---35534325346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=9+from+the+nine+worlds+pdf+downloadPDF 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_off0000b392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA4 14384 bytes
SHA-256: a7bcab1c618ec0702a2c75759b209e91fa438e215117a949371592aaa4485d62
font_02_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 10920 bytes
SHA-256: 66e5292dfde3a1285787d407ab083f2e65577f6278475dc37777544d9485e9f2