Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e020224f94faec…

MALICIOUS

PDF

75.6 KB Created: 2021-09-12 17:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca3c524d173fdc8f744eb86fe9a349e1 SHA-1: a9a603bd312ecab99d5a3b758a18ddf5a4e9b679 SHA-256: 86e020224f94faece11180653131eb15f158bf8306c124e7c567c822e19959bf
164 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, forming a link farm designed to redirect users to potentially malicious content. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=desbloquear+redes+wifi+android
    • http://ueros.fr/admin/ckfinder/userfiles/files/xigelowovenebus.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/jutime.pdf
    • http://vektor28.ru/userfiles/file/8596200441.pdf
    • https://greenways.at/userfiles/file/rifewevitoderiruxuzuj.pdf
    • http://www.sas.edu.mn/ckfinder/userfiles/files/wopiwisakeb.pdf
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109090423428864.pdf
    • https://akvanova.ru/sites/default/files/66681716058.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d45ec84305e99cbf572abdff61a3b08b/muxerukedijuware.pdf
    • http://hkxhjfc.ltd/uploads/files/20210901185732.pdf
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/kupomewukasutaxov.pdf
    • https://kaptenhoki.com/contents/files/lupajijuzawokuzakibinowu.pdf
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/nixarizupaputixedoxexu.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/dfb4844b9e39f751660a3616561ff9c5/64751151074.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lrlm8n3082qgfc2c2fevkb2jn1/70861290353.pdf
    • http://seidels-mineralienwelt.de/images/uploaded/file/vagazokedifas.pdf
    • http://metamorfozyayincilik.com/userfiles/file/takeluzopu.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/laxuvolijut.pdf
    • http://sten.kr/club/data/userfiles/file/20210904145037.pdf
    • https://ketex.com/trcgp/ckfinder/userfiles/files/telegaluravitimakegijow.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/supok.pdf
    • http://esejsc.com/upload/files/47958400604.pdf
    • http://www.jindatunnel.com/up_files/file/34614005210.pdf
    • http://carsonpokebar.com/uploads/files/muvabidaloxoxodogekaj.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad51a3360a---87597715824.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_off0000c3e6.bin
6db1558891524a59d8f041afd32ab3d1a7649f8a0777254c62d321c1e8e01170
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E6 10720 bytes
font_01_sfnt_off0000dc72.bin
510bb1e1c75bc5e18970dcefa37749e30128566902515cba0c7c5307440265a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 17232 bytes
font_02_sfnt_off000108e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 16792 bytes