Malicious PDF — malware analysis report

Static analysis result for SHA-256 3137e001e82dd296…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 09:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54c2ca3578f186e7fea48ef10287acf7 SHA-1: 0906eabbae7a8070acfcac83650af10152070ad7 SHA-256: 3137e001e82dd29696fa5fe8d98058d91e8ecc415c9ea33a5d0f4fe9a435b6f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://allytemp.ru/uplcv?utm_term=gm+to+oz PDF link annotation
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/um5bfgt1v864seake4l3s6eom4/66518685408.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/wedamozonupu.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/12883241634.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27536389634.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/46464674382.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a283c338c3a---zelinuk.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/sufewolulapakos.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/jizidosuji.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/navizuwusuv.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f65f9eb4c5e---55836740934.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/bezosalonugunusewedip.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/kodexiwatifulabu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609235dec8953---fosemuropekifukibud.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/sodugelulubiponozukuluf.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/63164968585.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/97800839463.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/nidobupima.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160976363991c0---92190339584.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/86525400273.pdfIn PDF document text
    • http://byecook.com/ckupload/files/loroxojadaxone.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/31552090058.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/b35veri5l88ltjvur97o5ne720/29300751644.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/1817134313.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/14740942026f96825846c8b58dad1e09/52484454495.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/leruzaduxumudegiro.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 9564 bytes
SHA-256: 6defbf0e75307721d2a92c733e3a5defa1f23971b93c2ff3562b75cfd36d622d
font_01_sfnt_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 17760 bytes
SHA-256: a2ec68151acbce5feb35e973265d4e49343a7be299591b8628c223a0a14033c7
font_02_sfnt_off00012810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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