Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f121778e06ed51…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 20:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92ba7b920e6eed71f720b34640d03ede SHA-1: 6576370385c23aafad5b0e42d11efb0ad1615521 SHA-256: 84f121778e06ed516a98087809f3f632c8393b4fedbcce0e49d8230bc8e873ff
204 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. The presence of a 'password-protected archive handoff' heuristic, combined with a 'download button lure', strongly suggests a phishing or social engineering attack. The document likely aims to trick users into downloading a password-protected payload, which is then intended to be decrypted and executed.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/wedukugexagugofujokab.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132a8561f014---gunamur.pdf
    • http://turagent007.ru/userfiles/file/44775689938.pdf
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/gitawesegegukubugovesav.pdf
    • https://epagneuls-bretons.fr/caningest/images/file/kijumoje.pdf
    • http://vuoncotichdep.com/upload/files/buvujaretadonesetifuke.pdf
    • http://resumesfromabove.com/userfiles/file/majitefudonidij.pdf
    • http://tabletopad.com/images/file/77432240426.pdf
    • http://tuzoltosagmihald.hu/userfiles/file/jixunaritesuxokez.pdf
    • http://baovevietnam-vnss.com/upload/file/36071210508.pdf
    • http://yugreat.com/filespath/files/20210911225752.pdf
    • https://voyageaventurenepal.com/upload/files/witibufulabodijez.pdf
    • http://warmistore.com/userfiles/file/10226185364.pdf
    • http://stavclearing.ru/upload/files/17519602787.pdf
    • http://syarmarka.ru/userfiles/files/60711629384.pdf
    • http://shbaicun.com/userfiles/file/2021090213004973499.pdf
    • https://liho.cz/UserFiles/File/nivutibafu.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8ba37722---vomatagosej.pdf
    • http://www.enfersalus.com/ckfinder/userfiles/files/10638029398.pdf
    • http://auburn-properties.com/userfiles/files/wovigixavafik.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613642575ac26---22661641024.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d5695e88a020c352dc6a372391267ef6/12026193200.pdf
    • https://buddhaart.in/userfiles/file/gawipokibanobe.pdf
    • http://omonetach.pl/foto/ilustracje/file/43771773739.pdf
    • http://sten.kr/club/data/userfiles/file/20210902012738.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161384eddb7aa5---bazusakupadanonorunijafu.pdf
    • http://studiolaviano.it/userfiles/files/lupediwodexajitob.pdf
    • http://mcutech.net/files/womubavowot.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gta+vc+cheater+download+apk
    • 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_off0000cf33.bin
18448ff59fedb51d78c52b8a3b51d89df84871feeb9a8a8a4126498412ac2100		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF33 10632 bytes
font_01_sfnt_off0000e790.bin
d6a2a49bbda7d6ffb4f8a545e3a751c671e77c05c17a6143dc04bd97a0e5db49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 20580 bytes
font_02_sfnt_off00011c29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C29 16792 bytes

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