Malicious PDF — malware analysis report

Static analysis result for SHA-256 95840a4c39751c04…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 01:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e195868a5a98657af402bfa7868c4a3d SHA-1: bc8c76e4286095435099f3da5170a5f7a98cf73e SHA-256: 95840a4c39751c04bf6b11385a239cddc73ae4ddbe0cba8eef1c1248f7d7f293
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a link farm pointing to compromised WordPress upload directories and other disposable hosting, indicating an attempt to distribute malware or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bkm-market.net/userfiles/file/fojojasejibatotakupodef.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608a574992a3e---sivaresaj.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4da322836---pafasefo.pdf
    • http://scea.edu.mn/ckfinder/userfiles/files/37368557314.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4ba67a91b---nuzewafanekipisum.pdf
    • http://marta-galan.com/files/varios/file/9991688175.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/reledenizaratejesebefe.pdf
    • http://2990592.ru/ckfinder/userfiles/files/19170726670.pdf
    • http://worthingtonpark101.com/userimages/mutazuninepedidoxamabe.pdf
    • https://led7.ru/file/36024395462.pdf
    • http://arci-mp.fr/admin/File/jibazudipexod.pdf
    • http://skncn.com/u/files/39843503275.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160730863cd482---34536444515.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b45dac42dbe---21512775202.pdf
    • https://senhewood.com/d/files/wewajasupipu.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/39664120308.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161261e9aa0f14---wepeditotubofugeveravizin.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2b78989334a617dc3e5f99e47bbae0c6/fezugaxiwixafurusojaforun.pdf
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/34260813949.pdf
    • http://fszhenjia.com/upfolder/e/files/20210730010015.pdf
    • http://carscaso.com/js/upload/files/kozotexesiwimagoxigad.pdf
    • http://metrocars.london/survey/userfiles/files/tuxila.pdf
    • https://nmg.lv/img/uploads/files/63764968312.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=srb+manual+of+surgery+download
    • 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_off0000cfe3.bin
a84fd578a13f7532239135f8ccb6c8b514cf3cb8b77620002a8aa110b634160d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 17476 bytes
font_01_sfnt_off0000fcec.bin
5c4fd508958caa2dafce5aa31b1fb893d66a9222dbf05c763b70db4a2a5310a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 11024 bytes
font_02_sfnt_off0001166b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 16792 bytes