Malicious PDF — malware analysis report

Static analysis result for SHA-256 39660fc994fad2f2…

MALICIOUS

PDF

69.3 KB Created: 2021-09-01 05:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a282fb443dda04d13710a6a7fcaaa54 SHA-1: 181ca7c3a4cfc87372b5a9e47ec0258bd076a6d2 SHA-256: 39660fc994fad2f2a41ee8c904ee4a6e761d44bb95e157a77ce82145a90d09a2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9108

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 https://coretry.ru/uplcv?utm_term=365+days+streaming+hd
    • https://puppometalli.eu/file/wenala.pdf
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/nifumugupotabujuro.pdf
    • http://halanmilk.com/upload/files/14121005660.pdf
    • https://telewebmarketing.com/FCKeditor/file/40946920843.pdf
    • http://kolaykanal.com/userfiles/files/49700163169.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ui17s8u1paat4vm2kcul77utj9/jowofi.pdf
    • https://evermoral.hk/upload/file/1624735165.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef1bc3d77f---32259989132.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/912381586b2d3964be0e47aa0c4fcea5/86928806461.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jhijo3d2imediko1r9ds1thbtv/13293625378.pdf
    • http://fjzy18.com/image/uload/files/80953905479.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160baefec48edf---kibebugupo.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/zibitegotobefidajonul.pdf
    • http://manixcnc.com/ckupload/files/ledorad.pdf
    • http://tao-ssct.org/data/upload/file/15233378624.pdf
    • http://knuhpharm.kr/userfiles/file/20210714102854.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/87sb5j9osiuhjjagll7d5lthen/lasegexeso.pdf
    • http://kahounova.cz/userfiles/file/82823640682.pdf
    • http://cavusofis.com/images_upload/files/2070384603.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e97af1cebb9ded49d0c7b7443b633012/tupejogokapusa.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f246ddcc37cd63e802804298f77b900d/54016583114.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae72ba85064---37552136683.pdf
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/72249956076.pdf
    • https://aslplastic.com/ckfinder/userfiles/files/woduvatapulometutib.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d878.bin
9abf1b82fc7bcd3a0646670cdd4573968f8fb1dcb9f32f193569fe8aac535b7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 18476 bytes

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