Malicious PDF — malware analysis report

Static analysis result for SHA-256 179af1081592dcd7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 06:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b42284ff7c803b760a4b4030c3925f3e SHA-1: 18d677a6ebff0d2a8f5a2de049d53af4e7ab39d1 SHA-256: 179af1081592dcd7c0043233ca2d9aa1be4e50ecf9a143de63cdae02d9f5845b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to other malicious content. The ClamAV detection and ML classifier strongly suggest a malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=sniper+3d+fun+offline+mod+apk
    • http://bluebossa.pl/files/file/guvepega.pdf
    • http://bajajsports.com/userfiles/file/dofirozowafe.pdf
    • http://jessie.vn/images/ckeditor/files/wuzud.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hoihj7psn9je6iuv603aprtdbg/78626206746.pdf
    • https://seerupit.dk/assens/file/32790235992.pdf
    • http://huspanda.com/data/ckfinder/files/wigotatadawat.pdf
    • http://cleversystems.ru/userfiles/file/lubuwaxuludapigujoxajefe.pdf
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/33931710668.pdf
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/13437070636.pdf
    • http://kleinschaden-expert.com/userfiles/file/24837218116.pdf
    • http://saigonradio.com/userfiles/file/fubotilunosabasikuwotare.pdf
    • https://sopkambing.com/contents/files/1985587542.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/42797874440.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c22e8b2b3---pixagutudujuxasiniroxese.pdf
    • http://e2ingenieros.com/ckfinder/userfiles/files/bowebunasoxajuf.pdf
    • https://petek.biz/resimler/files/pekedolipibumepexijaj.pdf
    • https://systematix.pl/userfiles/file/17240297073.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bbdhskr1shbs5h6msflhs0hqh5/gamawofo.pdf
    • http://alvitraders.com/files/zuvadasukepasowukuka.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pivibazafaxo.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_off0000d7cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 16792 bytes
font_01_sfnt_off0000efe2.bin
23b1ee96d27792101d47b077ca8c5beef7035e17977a6e4adaf48bbfcca0f6e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 10832 bytes
font_02_sfnt_off000108d3.bin
1ff489994d9e24478c474860197335f4a2a8aa63096526260cb36272aa4abdeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 17708 bytes