Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca01c2ca4aa0ec3f…

MALICIOUS

PDF

85.5 KB Created: 2021-06-26 23:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: deeff0d6850353137b611c6f765da26a SHA-1: 5c50fbfca2f0a3248430df3edc01f007ad95722c SHA-256: ca01c2ca4aa0ec3f3380835640c089db696eba6223af78bcf56fa49661c11bb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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
  • 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://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ava7lrch8vc2uglejo38o2bg51/nanugokelekel.pdf
    • https://activepymes.com/pub/file/65786556513.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075d1e778b7e---debaxunev.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1bfb2cea---89160700319.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160968d4768f00---muxanujopefolujiz.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b39d2fb6---zeduramikodom.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085b00921318---lirir.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/f6f22bc2c863f38c11d041ed15a2515b/zosegabivejipozixorope.pdf
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/38234042099.pdf
    • http://aweibel.com/Photo/file/77416816750.pdf
    • https://triosms.com/userfiles/file/77830610640.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/7dacfb7dc4206cc93e47bc2271cd858e/dudotalezuwitolo.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160780833dae3b---redusugusaxofinasiwapazo.pdf
    • http://okmarin.ru/userfiles/file/sukerososivikipukovigabax.pdf
    • https://spheresignal.com/app/webroot/userfiles/files/dunopimux.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/q814legspgrk0u65464q4lqhh8/73004003920.pdf
    • http://vanxuantravel.com/upload/files/malobit.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f122b2ad9d---64809463322.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c44436f6f31699bccdc883e8af79a82d/48729499243.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/262a8fbbfdd64c451a3501ae953cc555/lazudetopol.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c699aa1e90c1eb17f113e45ab6b469f8/paravuditifonabebobisi.pdf
    • http://lookkorea.net/userfiles/file/golutasasoki.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/l0ra7iae1q8q1hqd9rc06pe1eu/xipisune.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+chili+recipe+with+noodles
    • 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_off0000edb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 16792 bytes
font_01_sfnt_off000105d0.bin
07ef6d3472b3ecc255786d206dac72d2aae8e8d747b7eb37e0b0c796f16cbfa9
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 10588 bytes
font_02_sfnt_off00011df7.bin
9e8b0ef529b6a5d29d9816d1f68bec1469eaa333452d3ded7027c49536193673
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 16692 bytes