Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea82260e31ccb72…

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 00:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 249a610eba303efc644c2dfd8b7bea34 SHA-1: 8c544b617eb2f51e7d0ad52816c034ad65921442 SHA-256: 7ea82260e31ccb727f8ece173149ae8fa883fbe0aadd62ab63530e7d0d46f37c
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://cructi.ru/uplcv?utm_term=fatores+de+risco+na+gravidez+pdf PDF link annotation
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/mpg5kunsfpstflq6soevv9q8h8/41608598137.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/xuvojo.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/64292689571.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f4201cb0ffa48a8504b0f28fcf883940/nujuguzakumonosule.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a04d3e7c338---55734880930.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/92371568497.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/84033608228.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607510cf5954b---wikubogaf.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/i5p4alott127e57dbp0lp8ri1l/22892800486.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1378b66ef66ca5b55b59e877307ccceb/92345180460.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210802_F8B84988043A3E45.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1bb115e65a2dde29ed485141afdbc646/baferitalafutobupef.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bba503f805---bozezekoniribibozazesepa.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/47770700862.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/16491447557.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/35743599379.pdfIn PDF document text
    • https://geniodelweb.com/file/velinilefulobug.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/burota.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/nunujilusowadusaxaxofena.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/76132535891.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/fa4c21844c3e076c4054bab288e8e074/53694741853.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a486ba4a6---80309530903.pdfIn PDF document text
    • https://baongochoa.com/upload/file/10664421827.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/95929518766.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b92615a81dbb115b6cc37171d80abd8b/fesulomep.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2808d97c---73300370325.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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 20268 bytes
SHA-256: 9ab1bb975bb6cd8b9f501ef57d1677968e7d4e8f68ace38ef7a450009590b0f6
font_01_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 10852 bytes
SHA-256: 833b3be1d818885507e212d1efad21b39675de95ca1f53db6e1765af9dccebd5
font_02_sfnt_off00012db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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