Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efa040803bd927c…

MALICIOUS

PDF

106.0 KB Created: 2021-06-26 00:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e40cc0a715bd70d5661ca308878c9910 SHA-1: be6e62a524e2158f82b1f5658c22600eceb823dd SHA-256: 6efa040803bd927c7d9d78b3a9ab18c80b44d5566709dfc8524b80a7c9f6a05f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the nature of the link farm and the detection names imply malicious intent, likely to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4664bc9c9---34949339582.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/bd9bc72b9bbd96aec868705fb589c77d/51878401887.pdf
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/bitawujupa.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/15393543610.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3e9bfe349cd064bd453ba6144c7192c5/11120441680.pdf
    • http://ufnk.fr/app/webroot/files/file/davokafuxoxovusored.pdf
    • https://jxloanchien.com/style/postimage/file/47446023327.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/56925510037.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9308d31982---ripanikipuzidoxagejo.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160798f2dc7a53---revajakebonejikevovavaki.pdf
    • http://aaaexpressheating.com/userfiles/file/65091268260.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ad04b32e57c---23521970747.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3v038cgkvou8u5013mn8a0rqro/kuvudaganorixepa.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kcv5bj8hp4mm7rkclvkebndu67/66269509788.pdf
    • http://kasaitogo.com/uploads/files/sageru.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/df592126dd227c1043d62e322b31112c/4523690985.pdf
    • https://aedwea.com/upload/foto/12184990563.pdf
    • http://www.cddfct.com/up_files/file/gojukamo.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/5c4a8649481b938a1a2a267b5e25fa9e/29892522058.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/rs44qud7jlqntj8k82gd07vt9o/wozibilolojuluwego.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4193fd54593ecb6286fca5ce6fea7ca3/2282815292.pdf
    • http://loscogliodifavignana.it/userfiles/files/97500942862.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/j3sifko4fp5c9mahi1m8i2bkg7/sibavojezunewotisa.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/948a1b1483f74532a9ce61b9ec9d3528/rekejefizupaxofune.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=green+wing+bloopers
    • 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_off00013d33.bin
d3139556afaed6f47dda966350707b6d2224ac4e8bf995fd49dbc9c4404d1ac3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D33 17132 bytes
font_01_sfnt_off000169cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x169CB 16792 bytes
font_02_sfnt_off000181e2.bin
60594560e513d38ced894010561048f0d5707f197c60ebb3e3cf467da3fe92af
pdf-font-stream PDF embedded font (sfnt) at offset 0x181E2 10432 bytes