Malicious PDF — malware analysis report

Static analysis result for SHA-256 17906f577b97fda0…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 22:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 602ad3dbe08a099f089ee480e3934117 SHA-1: cab738bcdebb75a3107c811f10dfb0f79b64462c SHA-256: 17906f577b97fda039f790a5fe27b2990a2a8584e9543ad0e74ff6446ccb6b03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23f2bc52f---xineputeratonusuwimopigos.pdf
    • http://wingmanplanningdemo.com/userfiles/files/87446391660.pdf
    • http://ippinnudon.com/uploads/files/48653477935.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/7522467090.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/htclsjcn65c8san8is96auqqsl/mekofibubogemeneloponufot.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/7qkmhhpmbr9e32khn9u3q6es4j/16272320726.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5942df9d39ddd043fd7ebe2a3c593344/jokipedaxob.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/914dc51ea641e9a4b800898a29127c2e/wokadifufiwavubunodudi.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/4def6hivs1ol0j3h3k18jft94v/62838256771.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfff30f9bf---466832000.pdf
    • http://sammyurias.com/userfiles/files/zarorodapafefatonorumamo.pdf
    • https://szabobuszrendeles.hu/files/files/xofetes.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/33703502723.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3739b3e4b8df50115cf5c131a2817544/414970529.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f9ebd4f5c---makobewut.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/t5mjp365gb7v6cebmsf6t2uve2/73666822189.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160901608df241---82117541486.pdf
    • http://gowowdeli.com/uploads/files/38588436238.pdf
    • http://tdbm.vn/upload/files/tiramugolumumotilerud.pdf
    • https://mfdesign.hu/files/file/75789819282.pdf
    • http://mikailang.net/userfiles/file/20210505095209_1228044047.pdf
    • https://biorenta.lt/ckfinder/userfiles/files/26426872844.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/mupuxek.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/615fe7c371e7f61a5314c0c8e2bd1b7b/ratizunelelezajapix.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/stg8ild9fg1aa5f5h5mmpmdlm1/47232079856.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=grasselli+slicer+nsl+400+manual
    • 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_off0000e351.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 16792 bytes
font_01_sfnt_off0000fb63.bin
267bc7db46889298d7bde0d53c9a391978616b3aa8599ffe23d681290f01b19d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 19524 bytes
font_02_sfnt_off00012e77.bin
749f5bada496ee2c7054f9e6113bc05d9e15c6eb04898b8959f2f8c8e2112ae4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E77 10512 bytes