Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43420af93cbf501…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 20:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c923138038188ba1a931d3ba95d0a19 SHA-1: 88b10ac2644a77874ba4666a4a6e0823b8961bdc SHA-256: e43420af93cbf5010b6b7c419466960bbf5e65305e7b002df843a8bfa71d6051
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised CMS upload directories or disposable domains, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external links and the high confidence verdict indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://businessdevelopmentcenter.pl/uploads/userfiles/files/jupuziwimuvovepe.pdf In PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/ovjv3i50su7v5062dui6rr8gf7/83734508565.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29549a0618---nugogulumaj.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/634faf3ccb3a23a446c21a01ec09a9fe/safekipovubejibaboko.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d607d040fccc5ef9c70e79e8699e51de/78802421581.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/lofibitijigokove.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a0317737c---kizipozarozoredufo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/ff9cf1b0cdbfc18d5931dc856112c20b/95075188566.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/tuvapajotisesutup.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vsonuhi81pgvo6g924t29hludo/fidijovodugame.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0579118333861cca82a938d574949a77/severedojovupejunun.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc4d6af3e25dd329e1c1bd3cd135ed2c/89044050200.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6c7ebd884cb4d45b839c5ac3abb80a8d/losutebamewopifulesular.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/17502588392.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/38414011057.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc371c6e81---xapajelaga.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ed63639139e---gaxetejemukevipuf.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ed8ffa702fc9193aad66abb4ebd39b36/61431587176.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/11668584930.pdfIn PDF document text
    • http://ashioke.com/images/library/File/12997148039.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161129567efceb---pawawagibozetarulavopuni.pdfIn PDF document text
    • http://slsnn.ru/content/files/valebeni.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/7f53d60ae18a8c08e47259c68409e537/pofapolovowiwavefubuw.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/sizokadigubazalejuzug.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/besunixodaviniwudelepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ipcc+6th+assessment+report+pdfPDF 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_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 10864 bytes
SHA-256: 3efcc6a1c918dac6cd3be2e075158ccd9812dbd7cc9c5c2cb04575959acf9d28
font_01_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001185f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185F 19900 bytes
SHA-256: 218e4ad08762413cefe7076d8a3c45aabb9457244e0491cd64f334c382e38d65