Malicious PDF — malware analysis report

Static analysis result for SHA-256 042f23a02ed00a1a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 20:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84a4d89fb5f2fa3021ec2b07967b9992 SHA-1: 231f56ede9524609cef8aad9a0fda0329848d3d2 SHA-256: 042f23a02ed00a1a1f6df3222faf1eaa173e7183051d37fb793be9db08de551d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

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 https://nomylo.ru/uplcv?utm_term=movierulz+pc+download
    • http://amy-tsai.com/images_express/userfiles/files/rizirofusajuga.pdf
    • http://www.rsvpcatering-ar.com/files/imagesfile/88351734511.pdf
    • https://visualmotion.nl/uploads/file/95569097568.pdf
    • http://vinabomi.com/uploads/userfiles/file/gerekitozej.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/da69ec4816ed6bc4151eed009efc1dee/71688329387.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161435e8caac96---64885001518.pdf
    • http://terrietanaka.com/library/files/60260200076.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/39974725054.pdf
    • https://elitstroycraft.ru/source/file/zufomimiw.pdf
    • http://www.lovebliss.tw/UserFiles/files/25733150183.pdf
    • https://limsurempat.com/contents/files/27740626391.pdf
    • https://jkmart.net/FCKFiles/File/konafubatixefo.pdf
    • http://refpecsbelvaros.hu/kepek/files/74144562737.pdf
    • http://studiopedrazzini.eu/userfiles/files/51016868641.pdf
    • http://chiari-web.com/ckfinder/optimist/files/ragatuposufew.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613304192e68a---99198599375.pdf
    • http://ansing.nl/userfiles/file/fawisisanewigepikinuku.pdf
    • https://avukatwebsitesi.kocgrafik.net/upload/files/solagolajazebavatakuf.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16131916c62e8a---moxuzenawono.pdf
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/zixubo.pdf
    • http://yds-wcv.jp/free_images/files/fogev.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/82835234777.pdf
    • https://nhuadailoan.vn/upload/userfiles/files/72299359000.pdf
    • http://harasim.cz/uploaded/files/54688630015.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/35359629147.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 16792 bytes
font_01_sfnt_off0000f45c.bin
8909db28123f4537772ed4bd73178339e3ba529532776052cf378f22901cdfdb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 17716 bytes
font_02_sfnt_off000121d1.bin
6a4ad7bc93cb57754b30ba5ac6f7a6ee54266b81d63f89832dc495b7671a3019
pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 10544 bytes