Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6610aaf71ff30b…

MALICIOUS

PDF

77.9 KB Created: 2021-09-14 23:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 080a3016259f529177c6d47d85a52eec SHA-1: 54e00619206ce0bd7168ecedbe3de750b3b05b3d SHA-256: da6610aaf71ff30b068c1622cc8595125dab673aecb653d7350690a982e83666
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://arabadvertise.com/userfiles/files/10893206546.pdf In PDF document text
    • http://grafitym.kz/files/file/fipokujositibu.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/95583872343.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/nosojenapiwi.pdfIn PDF document text
    • http://ladna.pl/user_images/file/vikopema.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dta238ks4lp764a6p3h02cp8t7/92885602297.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/xejekiwabakokowigoxilufo.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/76922544469.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/33925922276.pdfIn PDF document text
    • https://afayl.com/userfiles/file/33945695442.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210907203202012.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/49231484259.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d77de838---vikevetidejowosaninojonuv.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/kubigakatanaru.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/40015348840.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/lepuvilovubogepo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a43f05cda---panowili.pdfIn PDF document text
    • https://carlojans.com/cms/file/tefevuk.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/bemaniwosuxizirezusopo.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/nu983qallfqsn07c7rmann56ro/kukudafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+bangbet+apk+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_off0000ccb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 10524 bytes
SHA-256: 2d3f02562f1b2189b9e52a0d7207caf862abe0a171630f5d5ecc266fa192ec43
font_01_sfnt_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 17868 bytes
SHA-256: 7d604528ba9b0554781155c33bf62ad5f5c8152a1866e62a2699d49af5c85246
font_02_sfnt_off00011270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1