Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd24f8365096f22f…

MALICIOUS

PDF

92.3 KB Created: 2021-06-27 00:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e41d853dff5da6dca7e44f7e328f16dc SHA-1: 72ce6cf1cc307606972db92087d666724f279d25 SHA-256: bd24f8365096f22fea9bc59f9580f0bf3cb58c00a675566a634bd3c0f86d1a49
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be directing users to malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://familienarbeit3plus.ch/userfiles/files/8558864749.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/52597a4897e7d4e9dfc0aeb79d7d3777/zebewisosixadife.pdf
    • https://tylbm.com/Upload/ckeditor/files/kapezirigibosanawimewaju.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09468cb03b---xinowopemus.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbb9d3a33---98999072117.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/c6eura6oeac4a6pgbi797dv4u5/18202183134.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/486e6492bb961e3bd3c5f1ca150cda50/68034671895.pdf
    • https://daynexweb.com/upload/ckfinder/files/53325991064.pdf
    • http://amctop.com/board_data/editor_img/file/202105162149.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f741208ca---zopagejokigiguwitiperap.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c048cb79d9f---sonibef.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/uqsa053p6279uj8d6sml80g2d0/begepilelapusu.pdf
    • http://onnetsolution.in/userfiles/file/50737535251.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/svmdrgujalobvrmuskig1e85l4/98134778647.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160751e7d86f11---15457290821.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/0f34ffe87b623a2b483f70e083d57cb9/wevuxerujo.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609452eaea11c---45396692225.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88dac3b7f1---60782907806.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e9f220b0292b2cca70210597eb8ef83e/3813771985.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5c1015619d7984e7c208b0369d686a43/koxawiminetowimovemuwu.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba3b280e3---57813152314.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe3fcde607---jidibive.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cold+isostatic+pressing
    • 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_off00010238.bin
a6a5b1b421c37c419a173f942719633b9b9b4ca6c79a0f4a0dad91e3a2f8057f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 18744 bytes
font_01_sfnt_off000133c5.bin
c41578b2039e6dfafa66d7c18b1492673d162f384573670d9407bfa98b3c5b0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x133C5 10720 bytes
font_02_sfnt_off00014c4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4E 16792 bytes