Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8614d9cce7e2b9…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 14:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f883dc681b77a362943bcdac496a9b6c SHA-1: 2f08444430775a698a2a8c208849946c1f6196f9 SHA-256: 5b8614d9cce7e2b9ed1fe8561afe852facaa086bd2fac84e14add91ad8a6399d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, indicates a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://smidgel.ru/uplcv?utm_term=content+type+pdf+html PDF link annotation
    • http://raczcsalad.hu/files/42782215741.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/vifojomaminuler.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725754d7cdd---gitinewibolaporoj.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ef11ded62---45864689870.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6f492bd9bb3552f49fdc3618cee5c9c8/98900432135.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a424a45b6c0---bodideraxadapivomude.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/nilimuxagozogas.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c25940b444f---nojiwopakenosuzupid.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/31181471900.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/boraxilikogagixasus.pdfIn PDF document text
    • http://demkapi.com/resimler/files/kefokotugor.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210521220026294133907.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabea6ec52a---karakula.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/pijogosebuzebiwelomozak.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/94820048857.pdfIn PDF document text
    • http://texmet.pl/userimages/file/46525771858.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/bebutetobe.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/pekinezejovanowadizo.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/viwiwizodureni.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc9e7f725---11697154669.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f139fad5---33839532604.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/5445900877.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab514124c---63661773.pdfIn PDF document text
    • http://synowka.pl/galeria/file/10009176431.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611ae8d82a149---niwetizuviluvizimipejele.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/72472371428.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_off0000e264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE264 17676 bytes
SHA-256: c76deb567105ea37802b157903d8a257ce07099104b97bf1168db51df545ec68
font_01_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 15408 bytes
SHA-256: 82d7cccb3d1ce988579a08af2eead11f384e896b1ef004abacc4f9cc6897c934
font_02_sfnt_off000136fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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