Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a170874a6d3275d…

MALICIOUS

PDF

88.9 KB Created: 2021-09-05 05:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb51081d04b0134a44925117bed22ec2 SHA-1: e2a5b82515b2dd169770a53656f915dfc223862b SHA-256: 3a170874a6d3275da76bbde1d5946441d87dcfa84241b2f625b25585039046a1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to compromised WordPress sites and other potentially malicious domains. The presence of numerous external URIs and the classification as a 'Phishing.Trojan' suggest the primary goal is to redirect users to sites that may host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=japji+sahib+path+translation+in+punjabi+pdf PDF link annotation
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ede6e621ed---96882888435.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/64765624382.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/47396ef168935cbe717ed7f156fb471d/welebuwetelele.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129e0ee7bf2b---9890150496.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62ca101c4---2870741991.pdfIn PDF document text
    • https://ibextrail.com/editor-images/wowuxosigigetimilu.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/75492650553.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad893cdf4d---ruxefetofusugavuvexadeg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f8623da84---67233445918.pdfIn PDF document text
    • http://konyaalotaksi.com/userfiles/file/90953243924.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/66lcjao5tlpt3cul3j54qeo50n/nonuniluxuwofapewi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fab85b84b42---moxupugutaxukixi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/259bd6a7fb60549e2407aab2988f2704/49883388280.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/fepoviko.pdfIn PDF document text
    • https://superchills.com/userfiles/file/51628245361.pdfIn PDF document text
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/fujedigukuwajugolipivotof.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gofotemena.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/nunonokol.pdfIn PDF document text
    • http://coumert.com/images/file/76246313407.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16078ad559279e---sefisefopesem.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/be8e8f10f26d8964a72d746cc5507e65/winabosirenigexi.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a17b52343ca27c987a02e0fcd949f851/pabedutilefibid.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_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 10824 bytes
SHA-256: e088a66cab25e64ade760a3ebc0baa6a029ab8134ef8539b200f1aecd5cfa846
font_02_sfnt_off0001258e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258E 18552 bytes
SHA-256: ab80206880d77d83c06891d413e1d6d9cf9dc70612af819775de75f9ff3f1ca4

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