Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f222108165b554…

MALICIOUS

PDF

77.7 KB Created: 2021-06-26 03:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05de7cd46882cf1aa28369ab4c52ba06 SHA-1: edd55e39becde41c1119549b2d839f60b3fd0663 SHA-256: 39f222108165b5548a29449ba71aed7075dff63582eadc1d4ca48f57f8f274e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088496361e7a---295485489.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1900756206edaa692988a2173809e870/10504591847.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/99ba7a1c9039aed036ebfe40cd539689/43597157599.pdf
    • http://cyuanmei.com/userfiles/file/buferokejixijo.pdf
    • http://wsm.hk/images/uploadfiles/file/rijumuzasenaxadopalinuxe.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/601f28ac8dfec2634d2b36844c59b52a/68629359329.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bebf85b7885---lepox.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c740c67708a---mulakuzufomi.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573b88294c---74090878438.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ahj4s6gl8cdc97vn70uqcvhs04/jawesuvobidobinux.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5332d597f4d92b4553277cc0d7c372e3/99403110631.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6f91ecd73109dbdce5e2b6e3f11fc2d1/zovoduxofuxewimaw.pdf
    • http://ahcxdq.com/uploads/file/301851367999.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/d0af8285c62d4ba83374a022cd3774d0/88688251866.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1d220bae1---25287732761.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d8889a3faafa90c487b1460fb843f324/nowegowi.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a59f0594e3b7e710f19eb3e15151d035/1749577930.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e54d62f2eb9aad0df03b31554887c723/56100736976.pdf
    • https://communeouchamps.fr/userfiles/file/janodumizu.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-10/20210610000113227708.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6753decf06---35657718070.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/r15oc4tu643e8m2iqdl28f0pl0/kejinepopaxabadig.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/b1a00b4a2f88b8258deaa95cc6ba4282/fexotajiluvorisifibujab.pdf
    • http://dominoliberec.eu/images/file/files/5971016407.pdf
    • http://alpha-cp.com/userfiles/file/28298628545.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=html+input+type+search
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b79f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB79F 16792 bytes
font_01_sfnt_off0000cfb0.bin
47f9f61b34ff74b0c472a12676be11555bbacb588c798ff5d1f9c818e1a59797
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB0 16564 bytes
font_02_sfnt_off0000e666.bin
c0c6821650adcec9bd25cf6475b7fcabfe52114cfee03d5458761331c9f49944
pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 15892 bytes
font_03_sfnt_off00010f60.bin
ab537516cf351b92c56147d8d28842ea80adad99d1dd139cf3a60bd873bd70e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 10724 bytes