Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52cb9d71a13be2b…

MALICIOUS

PDF

213.5 KB Created: 2021-08-16 14:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: be3d3bfe0e38842c76e3479bdc9b48cf SHA-1: 07b0636bd9a2d449cbb8662196b72cb4a0c0f0e9 SHA-256: c52cb9d71a13be2bbe62aa15a19a9e968f09ac13b8ca80f92601551a9921e2d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or unknown domains, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics further supports the attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 5

  • 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.
  • 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://derkwoo.com/upload/editor/files/wifujumidosero.pdf In PDF document text
    • https://htapigroup3.com/contents//files/53997668528.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/42355694078.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d4ca0d74---sixinudovebamaxepowiwopu.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d779e481c---12417394168.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/tekafofobibimu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/plcj0a8603jc1muds7gij865l7/bolirafosiluvavabediji.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72d377570---fumene.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/92172164114.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/99922078807.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc955620d1---videsorovinu.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/32488863629.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/64104082359.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/36463756814.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608396acee2cf---92277080711.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/sivutixakis.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098af9349924---13043019783.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/98ar7i5k3e9od437km097pmqhn/32791503722.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/40373782829.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/56202692084.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/46572498824.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93261477538.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/88c059cd75ba920443b4f6ebdcd62973/damula.pdfIn PDF document text
    • http://nfc.soo.jp/file/28458592095.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/stqrv0l328tave0vbubcro96df/7829713793.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e6d8fdb3---dokage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=revolutionary+suicide+pdf+redditPDF link annotation
    • 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_off0002e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E3A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FBBB 20152 bytes
SHA-256: 9f4a0004217bfbd9ee4160c8fc3794bed1947d7d18dd9cd2fb39d06f5fd07a73
font_02_sfnt_off00032e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E28 10936 bytes
SHA-256: 5e4c7dfabfd3d510aa47e28e5d39197b152e6089a5c139d29b7bacae61cb625f