Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf2fc6fac938e94…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 20:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 363c6ba4f3f2abe487ae34c4e74c7cab SHA-1: dfa4afa5658ee43429155a0ea9fc119f66d945ca SHA-256: daf2fc6fac938e9464d9f580058e22acb9725a553d51c90465dea57cc315d927
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates it's a social engineering attack designed to trick the user into running a command, likely to download and execute a second-stage payload. The document contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9826

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://ligneus.hu/upload/file/nadejabuwojonomofurosi.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609d49c2487db---32343222721.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cd3936ac3---nenevakalumamiwijufupir.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609453535458e---92974998100.pdf
    • http://nensi.si/upload/file/2049521519.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b88a4592f2d---23860994584.pdf
    • http://driver-jazda.pl/upload/file/xivoxujufomepepexor.pdf
    • https://xanbiente.de/userfiles/file/tubor.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3956dab81---99450686516.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/424547e3cb6b9d83b3c80958da8e7482/94118704627.pdf
    • https://arte-salon.ru/upload_picture/zatidovonivakewejewilisuk.pdf
    • http://montaze.org/democms/userfiles/file/gowuga.pdf
    • http://arci-mp.fr/admin/File/wuzewasawisosad.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/iepogabp4i9tpo1avt8mvv2rfs/71676111038.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2p0o2j2igv12kqd1bheuv0fst4/45824384737.pdf
    • http://gmei.lt/ckfinder/userfiles/files/69536226310.pdf
    • http://www.anjhimayath.com/upload/file/90933540211.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b9794a437---lawuraboxisevazafozufexo.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d60c2bf7---95736292721.pdf
    • https://diaochue.vn/userfiles/file/81656195555.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/73843115607.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/p6ev65ppfjmg57mnqeulsidg33/1575097027.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b77604670d---29886514441.pdf
    • https://bem-sa.com/img/file/nixom.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210523/file/16217842092404.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d3d579c3401fe4db5c6ee34af1af8147/boxupalanifu.pdf
    • http://spalovnachemolak.sk/userfiles/file/dipepipedarawasiteva.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vampire+the+masquerade+bloodlines+unofficial+patch
    • 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_off0000ece8.bin
c489b839cac484fa15fe7207eac5633c82a1ca15d455a2c1b7cc9a80c2c426a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 11240 bytes
font_01_sfnt_off00010699.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 16792 bytes
font_02_sfnt_off00011eab.bin
eb083ccca4905afe80efeee52ef5a750271eafc325b4a7fcc83d1f40c3527a91
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 17988 bytes