Malicious PDF — malware analysis report

Static analysis result for SHA-256 588589316c0c2833…

MALICIOUS

PDF

82.3 KB Created: 2021-08-30 03:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72e24e62af4ead1d01ddf1120ff57bc6 SHA-1: be60a7ab8b9ddd97f1051ff35fe523b6e2f0f35b SHA-256: 588589316c0c283311945ba774a58c32bff01c42f7f9eb1a4a8a54b6b09998a8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096b89f547cd---8422656734.pdf In PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/wixuzuvuw.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/55677613607.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/oo5c81tqqrssqa0e70qh6fpnn6/zovunofiw.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1fb5f40f---weravowiwokomagudusik.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c909430eb71---pimosolojesizugof.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/sokutisesaponeruneg.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/xewabivenixokiridokemuwib.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/33410838454.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tf04vs7olldlbemgb4ktikbu4g/74054452998.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/lexunulesubetavaloz.pdfIn PDF document text
    • http://tdbm.vn/upload/files/lufojesigolawinirekaguziz.pdfIn PDF document text
    • http://mosjob.ru/images/file/megebitujezeju.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/kojutukerarofilajogil.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd1247dc44---xudikusotaraxegolozefimek.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/gusofudovowedabagudumuva.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5f061136b0f2c3255534df42227900cb/9019939995.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/1580793471.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/sesozinesunerizug.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210811_143617_9030.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4f00a3c0386465f3a898140a54a2d510/99673178766.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c625ccc020---70303279783.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4b9b4e6bfd42382b91583e0b23857057/42382345649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=completely+polarized+lightPDF 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_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 10772 bytes
SHA-256: b198ed8d7060ab7553ab8f394f1f8390421511f12ed1eafd6d530abd1f51bf52
font_02_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 18684 bytes
SHA-256: a209b077d328491763cccb1bc9dcb1b08337f7262965d7f78e7cb1309623ee47