Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a52dd9edce5350c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 00:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af48a041b9f403e4ddd13787e5eaf81c SHA-1: 39b801e2d62b3c2aead7175c2f02a920ebeb360d SHA-256: 2a52dd9edce5350cca81a671ba583ecb46a457589669de9ec7175b325cf077f4
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of many external links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://invision.buzyhub.com/files/nulos.pdf In PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/59855460589.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/41406787080.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73889409245.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/85554285066.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/nekupusivetobu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16137dfc4d0041---lepegixupig.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132667a6a827---43900880662.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/83727114036.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/74629906125.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/kibewafadi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364642c131f---11350166299.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbf77029a---15993360093.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/15706795824.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/punibubawusuf.pdfIn PDF document text
    • https://33mobility.net/uploads/files/pisepozobedijogo.pdfIn PDF document text
    • http://tiquital.com/documentos/file/67869322463.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/jowemifoxepe.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/3003929505.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/wonemewoxiwapugajewebuj.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210908113832.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/67887644153.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/nexuturupudakexoxexoboseb.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210909021328.pdfIn PDF document text
    • http://rvhifi.cz/files/file/jarexovidukuz.pdfIn PDF document text
    • http://rld-carbon.com/file/1059466047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pro+video+camera+app+androidPDF 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_off0000ba42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA42 10432 bytes
SHA-256: 34762ec3df53fb1d0d28e34203b0e279d2064ea63bc1e06ca9de6841af2b8fd7
font_01_sfnt_off0000d1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D0 16212 bytes
SHA-256: 0901110818e308d3712a5197eff6c3f045317ca141ac70ba3af2f03954cc395c
font_02_sfnt_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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