Malicious PDF — malware analysis report

Static analysis result for SHA-256 65aae3519e251a03…

MALICIOUS

PDF

71.3 KB Created: 2021-07-13 20:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86784185e574df46f0ff6cd2e091f871 SHA-1: a617e35d9a4fe612ae6d739d4389a93bb7027e4e SHA-256: 65aae3519e251a032c626c4ace274aba7a84d9be4948142384dcc1fe88f2ea90
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of links, many pointing to compromised WordPress sites and other potentially disposable hosting, suggesting a link farm designed to lure users to malicious content. No scripts were extracted, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://btegypt.comfile/sezubolalugirezusoboj.pdf In PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210530_AE9F7791090FD906.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946a62736f6---27253307361.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/34338525373.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3723a396---piwugiden.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/h0f7gvbj8lqbbmjbl8mjjb7k17/74393918462.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1624768374.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/43548466331.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d367eed234a3490e8c87fbc9885c0c3a/visojaza.pdfIn PDF document text
    • https://unosms.us/userfiles/file/27482146160.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c51352f70---tusozoguzazov.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/7a7n7m0b3qchttvjnmf0nle6cc/14282512489.pdfIn PDF document text
    • http://nktrading.qa/file/files/19959285709.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e8b98d8fbf6e2dc953558f5d433641a0/4996007429.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/15738135885.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4c6cb61b9---62100419583.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cnr56ofeqspoj4ldat65ctctsa/patimatowawawazomumud.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ad9e6510d9c09e003b13a8e347c3b640/97517775717.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2da873cd7e---tamuxagig.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/524e5e2c4289da17f7b7df431e1889f8/40555661359.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/toxudalanamolilegi.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/67788358442.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fe929280d0a5ce4ab7f300d10b843346/gudifepedemojuvuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bc+punmia+steel+structuresPDF 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_off0000b694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA6 15996 bytes
SHA-256: 57adeab1e5f28fb9e5e60a479e89c125b3b79d6442925d3c915839d2eae57a53
font_02_sfnt_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 10568 bytes
SHA-256: c1a8713a24424a62a456cfc825499486eff44cc4824690eee0e00790d242fa2d

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