Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a93e2c669c6b3af…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 03:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bed6904f4491ed445f5ba004f0103d9 SHA-1: 6c6f71e4cdca07c3be24048d9b0616348241a8ef SHA-256: 9a93e2c669c6b3af54e4fe3baa387f272d11182a2988b699c355df095ebf6340
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of multiple links pointing to compromised CMS upload directories and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/gffjcujbm5e9taee3v8cq22aj0/somuvapaluvikorep.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/mtjglkdsaflgrj3nhb8sfdb354/69955648749.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/0e9c141df6aa923d273e3a0aa225f03d/32792711393.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f8033526374b03128ebdf01aeaaaf7dc/10700607336.pdf
    • https://hogies.com/includes/template/uploads/file/67704092909.pdf
    • https://babamore.com/upload/ckfinder_temp/files/20210604022827.pdf
    • http://homelife-superstars.com/image/files/bogubirevazulikewalufelu.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c7ce38f2---zovavororatud.pdf
    • https://allmassage.net/upload/file/20210514062313.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/lqgasufqqsbv7frd0hd1g4ok51/50039838823.pdf
    • https://saleskerala.com/ckfinder/userfiles/files/morunixejedoxup.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6309fd0797---21446812335.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/bufibeli.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b09373654eb7db96874ecb36aba3f7c2/sebabef.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2072ee56a---64740798154.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/86f91d5f8e38b63dafc8acdb8842749d/67751327858.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949e8001a6b---51806568006.pdf
    • https://almuhja.net/ckfinder/userfiles/files/simaperewa.pdf
    • http://castrolmintabolt.hu/images/upload/file/gakufozenosupalizakagubu.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4255fa39---jizexukimuger.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/doual64moelmmgj38efttacp1i/fifulepize.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e19e45192---riwumenosijexelexo.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e578509b8---11263291336.pdf
    • http://www.hussco-steel.com/husscofiles/files/nelotefibudo.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gasafetusibag.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8664760082---85850141475.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+is+a+node
    • 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_off0000ee70.bin
3eb3e427b39525112e769a6748c79fa7857a21559c303b840f6c697078fdda32
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 16980 bytes
font_01_sfnt_off00011a96.bin
99ddae59bcaa33879563bd2309dae2facd7660e149bbd4299fb1c4a6fda1ae27
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 10192 bytes
font_02_sfnt_off0001316c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1316C 16792 bytes