Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc811d80ec1009ea…

MALICIOUS

PDF

93.1 KB Created: 2021-09-07 13:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f040145b4c5a6e61073d8ea5da95e4e SHA-1: f7d93acb8807d8592eacc81cab2a9cf6ed13dd57 SHA-256: dc811d80ec1009eac72eaafff6f1f96811169da4dd61d55e783b60e1fc25abc8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, including links to compromised WordPress uploads and link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=opel+corsa+d+manual+2009 PDF link annotation
    • http://ccadl.com/files/20210707194951.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0fa756c4---77102654982.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/5783512414.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cad4535b---4308808766.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160838480396f4---87606131310.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/lumomotuxukixitudategafif.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60D2287846A8E.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/49946371694.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/sakor.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/98778914398.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/bekefugeluliludeto.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/15997762607.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/woxosivajedowapazak.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/4823615301.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/55649495271.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/zuwivinewajonaxinas.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2388af9567ae070843de4fff66f99562/84452535702.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079d26831f72---vexasixinujexur.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/17f36b340087c22fffdb8d2b2dfd79b6/borowalofodo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f7431dd6f---jaxerepowexikofos.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/jizijodetiguxazaruze.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae75055f03e---pakupakuzile.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/3887534053.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/41656691105.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_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 11020 bytes
SHA-256: 35cc6743fc2526d47bea011e33af8a6d2fe0803bd5c4408c141c69fc41864bba
font_01_sfnt_off00011a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 19896 bytes
SHA-256: 7075b5928fdd1089f343f72a054c18475c265015bcde43f7279a1a5c43051bb0
font_02_sfnt_off00014e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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