Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0b5f70eaa2cea5…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 09:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 642420104a14c9d59ff0818c92165ff4 SHA-1: 132c0448b7149e05705a8c573387bc190e8d6e51 SHA-256: fe0b5f70eaa2cea51b9d53441aa5d15586adeeeac48ed35f537db2a10279efed
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/uplcv?utm_term=rut+meaning+in+arabic PDF link annotation
    • http://myucpb.net/userfiles/file/kitijowis.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/rifuxedokuvejizefubimedo.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/08/20210829180800.pdfIn PDF document text
    • https://anfauglir.com/images/file/zitalusaludewadebu.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/8850358560.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/83963595646.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/82938055805.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/26917849007.pdfIn PDF document text
    • http://zuche0551.com/upload/file/67585447122.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/929d52bd5681b921a983e528bb41236c/rugebebagosavamilew.pdfIn PDF document text
    • http://abroadster.com/files/gabojowo.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/pedalapevibik.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/44e6df8663a543927ca9671cbf399769/84466454335.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/14712910935.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/zaxefipesevig.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/f1lg67gobglh1i3kiulplt62u0/xixexerujudurogu.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/sovhiqtfgnknb1k09kun7177v1/xozaguzeboxefinemat.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765e8a539fb---88086272252.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8b4e2d12983c38844a1e643395b679d5/zafenirijomepa.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aff5489ed---tagegabebenezarikiz.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/96473216386.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/53247927135.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/58c08fee79737082dc584309133fe6a7/27630679523.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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 10524 bytes
SHA-256: 17a2a9be7752471568efae5a4c98ed0f31eb8174930b75cd37168c9695be1318
font_02_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 22852 bytes
SHA-256: 73a6dd55b789114e447d35c6590cbe61b88cc849dd3cf9a7659b23636510375a

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