Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a503b5ebca9c92a…

MALICIOUS

PDF

84.3 KB Created: 2021-08-08 05:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34cdd39631a15b55f04574458fda2f47 SHA-1: 40e1fea4875a8ea9417dd588a9144a2f04682a39 SHA-256: 6a503b5ebca9c92ab996116a3f9acc335ce1f855dd0b9325184f97b7c16a0869
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support its role as a link farm for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/uplcv?utm_term=difference+between+formal+and+informal+assessment PDF link annotation
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31997b7ac6---90752182545.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d798d7a4137---sivapubetezebojub.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3640dcf67d---78897651314.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/borazipore.pdfIn PDF document text
    • http://alltechsro.cz/files/padebitadaforuvib.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/mowokesanumojumerowuz.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c58aaea8c10---kujasadux.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/54970547673.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o74b3egteg6oq7kahiea1j8a0n/55808029495.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/53933525263.pdfIn PDF document text
    • https://rivnerun.club/images/files/morakomufebizasiduvugif.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/13e8560b0d783923d80432acb157e587/67845912999.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/91521344043.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/40760065780.pdfIn PDF document text
    • http://www.asslar.de/downloads/furelupesorewof.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa44ae3b2c---volufibenoxowefepofakuv.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af1074e3c9c---64914495887.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf870c3792d---lazoke.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9ae2ce4f3e9048ce73f5c2b98c1637dc/lanekimesiwolerunu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430144514563642.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6a6d15add2f7cc84cb8f7d9ffb94fc7e/35641099843.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/67009671895.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/49dde3aa9b922b0c7c1127fd355b5c4a/mivasilepobadafujemo.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/6holf7d9eu2rl9imp3if50sgno/wolovafetuxewuso.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_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 16224 bytes
SHA-256: c414a8fb2c13d5af8ac642a5d318301ccdde6e952cf74f08ecc4ba80d22b47f0
font_01_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 10864 bytes
SHA-256: c47f7a1672e7c82043008ac6bcabaaf0444703ba2972534188f00b8839acfef5
font_02_sfnt_off00012aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1