Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31bf89c022eed2e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 15:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de9d965906eb3d668011df0eace01be6 SHA-1: 688674889c2b50b12eefa45500260b8fdf358c39 SHA-256: f31bf89c022eed2ebf08065d9f59ddce59897affb54fb09f5d68c96ec16a19d2
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The embedded URLs suggest an attempt to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5210

Heuristics 5

  • 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
  • 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://dainichiji.com/upload_ckr/files/35489790731.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/45c47c25a82b9625cc2ce3016295874b/44450958786.pdf
    • http://palaciodelosnavas.com/userfiles/file/6306519623.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e830a682bc---17828887280.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/40557226020.pdf
    • http://ahcxdq.com/uploads/file/031711542537.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16125552b37252---fafafesubod.pdf
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/93514230030.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/6p2qn77s33g0qv5iee3e8ncu2u/fiwomamosejakidunutitoj.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608057e9844a4---13786613517.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dd49bb2a8---zevewajukofiz.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611455a658fc9---34211345085.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nuoeo2kd972eahfvks1oggqibv/popeseganefinuxuzowa.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/71406ea175573deba1685f9c19f11513/pewisufupesiketijeworoz.pdf
    • https://hongmao.tw/uploads//files/202108040037433923.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b6161809d30---20671977713.pdf
    • http://nhatrangpalace.vn/app/webroot/upload/files/gepawomiz.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098317245693---kozuk.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126935a21454---jitilonoza.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/4bfuq83cp3pie7ri6ra87ce8o0/telumi.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16095b480954f7---bajifofejarizokexen.pdf
    • http://schokozentrale.de/idata/63497057100.pdf
    • https://infiniteprospects.com/FCKeditor/file/15584440503.pdf
    • https://www.seblocation.com/ckfinder/userfiles/files/65284481309.pdf
    • http://akkoryazilim.com/userfiles/file/xebuvanuzumujasemevi.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f7dc4abccc96fb675de895eb466d311e/47159386377.pdf
    • http://beloezoloto.ru/userfiles/file/7486246465.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=stop+check+coolant+service+manual+skoda
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001027c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1027C 16792 bytes
font_01_sfnt_off00011a93.bin
7cdc0dda9ed6ba0dd673e1cad128b7a334964d22bb0d092b951ecff189a04523
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 11112 bytes