Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bf8232e7d0e386…

MALICIOUS

PDF

88.9 KB Created: 2021-08-01 09:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d82d433d6d447f8303f2bae59a8073ae SHA-1: b0c98931ebe78be5087888b5ce77f5713d977af9 SHA-256: b0bf8232e7d0e386bd64d59e1ec91b6fb7bb9bef665bedbe289ca47f6be47847
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads, specifically WordPress. The ML classifier and ClamAV also identified it as malicious. The presence of numerous URLs pointing to potentially compromised sites suggests a phishing or malware distribution attempt, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bee08cd02---22528792721.pdf In PDF document text
    • http://chandigarhdatarecovery.com/files/file/kupowopesine.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/836a55134545dadd9f812f147e1c9196/56600496387.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/67826012315.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/897b1db00d8b278aa05859c54f523ec0/kesonifika.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/kkibghlctv9ts7qpgitsplmjon/15391614723.pdfIn PDF document text
    • http://fields-on-earth.com/webopifaririzodelera.pdfIn PDF document text
    • https://lordoptika.hu/files/files/pokurabiwalo.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/dutumepuweraxub.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/8874570560.pdfIn PDF document text
    • http://nsureunion.com/clients/71556/File/41812848723.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608551c46bbde---79553564469.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/mutokezawavafaf.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/fudafelujopuv.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ga98ip5pid7ihpv3msuu0jigj0/wiruzasumakobepeg.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5a850ce1a---20868998382.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f55ebe049d---28385841754.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771fca2b51c---xefajuxuxemeto.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/24144485375.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/74411742015.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5544a722---49706365471.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16091b795e3eec---povubadinajavulese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=can+you+find+cell+phone+numbers+onlinePDF link annotation
    • https://lapdonline.org/file/xotonexotezotojewoz.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_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 17732 bytes
SHA-256: c6c0517943946b9be92ffd003e3074de0a2de572f6964af077405a045278ca52
font_02_sfnt_off00013b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6D 11172 bytes
SHA-256: faae08db8ab6a86ae11009102f8fc8830f382e7b2cd85b6aaceaf7142b9572b8

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