Malicious PDF — malware analysis report

Static analysis result for SHA-256 2785f8ba433ddc4a…

MALICIOUS

PDF

89.6 KB Created: 2021-06-28 16:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee8ff736922f2d1c8504c9e9bf2bcdf1 SHA-1: 35bc9f1816f6fec54ccab7585a77e605b7b5d4f9 SHA-256: 2785f8ba433ddc4a69805954a7693f7f43fb49f438a7e6384657d3ad31bc838f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple compromised hosts and disposable hosting suggests an attempt to obscure the ultimate destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/5dc42f596ab42d0fa4b9fc15bb263d7c/69339836212.pdf
    • https://eqonetech.com/upload/userfiles/files/62662838757.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/70105277323.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/e8caa63c4964abaa0b4cf8ccc0915d2f/23500580771.pdf
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/12903464205.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/95313a3977e8010be212f735c2c7cabe/29730098007.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/315aeeac6ab124ad255427d51fb0df2c/kozusadidetawawoboxeri.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ig0hbokjrsbrn23e01ubbbe1p7/degetaximawokevutor.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608294af187fc---xajizesafu.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083e00776573---kulinufenolukepegupunik.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c84a8eca4---putidotuxosafuganilo.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9f7f7180b---nafufizalug.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc96b3b82---xojuwegagogavifoluzufi.pdf
    • https://lienlacanien.com/img_pages/file/fuwenezinebebibuwejipi.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5b5704eba---vajexotojena.pdf
    • http://auxerretv.com/content/public/file/wibak.pdf
    • http://jaika.in/images/documents/files/povijuwikinakixogi.pdf
    • https://srmhospitalities.com/images/bulk_images/files/62673181637.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d74cfc9715d---xitebebikasu.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a8eb60cd0075f0c8fe62ba5d9baf9599/98246315621.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9c6b1cb630c8150af03245f8e95961b1/rizopuxize.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/60a2d2b73ea315952f3171cf44c2ca14/zarizovawojutojaxoda.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c188931746---jikeros.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/41619046887.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/69722023db1d75b0e01ebd2ec90fc5ae/lupovigimigarugogufakeme.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tickly+throat+at+night
    • 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_off0000f93d.bin
342eb1cb17f9bf8cab3b451ea7cd4a0098f05300d672bd98551bc895ec2b19ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 17764 bytes
font_01_sfnt_off000127fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 16792 bytes
font_02_sfnt_off00014012.bin
e55c833d6eb1dffe9486f89b86d64939707ce22fc6193522dca92ecd3bd4bf4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14012 10376 bytes