Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b4d7661af0c515…

MALICIOUS

PDF

78.8 KB Created: 2021-09-14 10:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f0be2da3ca28f577e57dfc6678f5353 SHA-1: 3c9d7d4379d0d00e6a3112ae8e6df803c9e4c715 SHA-256: 60b4d7661af0c51582ce95c4c1bd945e2df1443adf9a90118c79fb5008e6884c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=procreate+apk+premium PDF link annotation
    • http://driver-jazda.pl/upload/file/68599163710.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f1a00638---79637717015.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/69444417535.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2ba3bb9c857822fae348520a056be988/64070918429.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138ace880f48---23231094422.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/43990863305.pdfIn PDF document text
    • http://thevalleytrader.com/files/ririzilufidit.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/sojujadetosigigiw.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ac269da7f4f96df44abdfa4ec7b857c6/luwenejisatadufizumopi.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/lenineditalaniwega.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/rawereropomalur.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/giziduparivasibigezegila.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/zufufidunogewejijove.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/5671295206.pdfIn PDF document text
    • http://checopharma.com/upload/files/bowixowopewamividumu.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/34374126197.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/kerefosoxategafimajame.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/rosedudepin.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/91561764307.pdfIn PDF document text
    • https://vestol.bg/files/file/tiseder.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/90081500360.pdfIn PDF document text
    • https://brukspec.pl/upload/file/28617092536.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/bunedenajar.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210902085000.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_off0000d10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 17524 bytes
SHA-256: 3e9f3c6cb42941fd593f1cd65f7c158cf211438f11e85e7bf8c0d19070d96834
font_02_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 10412 bytes
SHA-256: 9aa49c974c1cf9ca6a8169f0af0784c51d1602e1d85989e29e39ef3de2761ee5

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