Malicious PDF — malware analysis report

Static analysis result for SHA-256 f050833da8821c31…

MALICIOUS

PDF

96.3 KB Created: 2021-09-19 22:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a76d0218c5ea9d68b31fbffcb47f7a25 SHA-1: 64272a51f8dd13af72aded4f3f29313e67029ff0 SHA-256: f050833da8821c31f1594ea13348b528b316d4c50420812a5399a7c8aa8b5f3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous external URIs, many pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or redirection scheme. An embedded JavaScript stream was also detected, which could be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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 http://cambridgekapurthala.com/damana/userfiles/file/95006328827.pdf In PDF document text
    • https://muzeumkonstancina.pl/attachments/file/zilenupelaniratatonifam.pdfIn PDF document text
    • http://tinhotsaigon.com/uploads/files/tisabosugiwos.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/thqk0f4jinpksdradjkd56t1g5/dosipaxikuf.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/95387799081.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8200a98e92aeb8023c97fef52a5e9a8d/68551080297.pdfIn PDF document text
    • http://idealist.ro/userfiles/file/69429657678.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161427ca1334a1---75004418194.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/sanosujejo.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/88931914979.pdfIn PDF document text
    • https://serka.com/serka/upload/files/getajo.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/sewelafa.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/9827847852.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/54080188437.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/93844508293.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/84296784238.pdfIn PDF document text
    • https://kaisar168.com/contents/files/gavilexud.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109112032558576.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/tajagemuzozozasalin.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/96021277543.pdfIn PDF document text
    • http://aweibel.com/Photo/file/28346421236.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/zururivixubine.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/larotomivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=baloon+td+battlesPDF 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_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 18724 bytes
SHA-256: 398dd618cf3e94ac0dacf0bfc0cd367a54085d08f50262ca4f0f73dad24359d6
font_01_sfnt_off000144f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D0B 10244 bytes
SHA-256: 85e17fcbd3601afbd81f3d31ce563911820f06a44a8beb46fad7336a55b9b72d

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