Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20573d381bd86f1…

MALICIOUS

PDF

125.0 KB Created: 2021-07-29 20:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b15fa8c213682b30e8df206b4bc7b4a3 SHA-1: 83e17006dd70bb4b0c58703aebfdc8eceb938d07 SHA-256: a20573d381bd86f19eb64d25bf618acb4823f7f09b4b013abbfa96ae347a2703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities or delivering a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=diya+aur+baati+hum+episode+60+2014 PDF link annotation
    • http://ebd.su/UFD/7623/files/monomovazajobimenuselenij.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f91a8463e34---2978298044.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7eeda17d6219c8403e354e5c0dd54821/65868344129.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/8b31f7992f293e1945bcf7127be5f278/sekufafasotuwuxuzavoga.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/21756334902.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ec4b3a271---26691098766.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/317843574.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bccd970249c---33431135215.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/pg7n74phnkko9507utr8g9068c/vipezazepezugaparul.pdfIn PDF document text
    • http://cortabellanews.com/userimages/medulujamitomuvotoweke.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/73630075622.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/tov2uns2mphh6fom8mvsod1i5i/56672943292.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aab2e32f8c7---raxinumugogudo.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/nuxuziwirijunagoz.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28d2e322b---muzidewalironetilalu.pdfIn PDF document text
    • http://cke.hk/userfiles/26872248525.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f283150927b4161fae44a4732084dfd9/fufefof.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/5d53g43p9jm4kln5tnq95sm1iq/89394881546.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/xibinoxawazudafixubegopev.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160724ca6f18c7---57739924653.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/folofogifatidulasafi.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/25050705790.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160975d87268d1---26857062503.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16620 17160 bytes
SHA-256: 7ca57b2c75052cd939f7855924871df3969ba36a73dc8abf7988d9011bcbca32
font_01_sfnt_off00017f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F2C 20920 bytes
SHA-256: d1415d9b93f42942cd7bfba32eed04be2355d5390a1fc49bfa8e1e4ef3d8db7d
font_02_sfnt_off0001b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1EF 11404 bytes
SHA-256: 33818f18d93abbef484478a17c34beb2a7fb3862d25baf1c95432ffabed20423
font_03_sfnt_off0001ccce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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