Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed42c52733ddee07…

MALICIOUS

PDF

83.2 KB Created: 2021-08-29 18:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed35499528479bc2efc14ce6a9227fc3 SHA-1: b2d64830bab85947da4509f07ef10538ede516ae SHA-256: ed42c52733ddee07c6e3851fad69a6553209ec51eaa8fa661a8f38ec36cf16dd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allytemp.ru/uplcv?utm_term=quiz+on+english+literature+with+answers PDF link annotation
    • https://censcakmu.org/board/file/files/41692229925.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/83308085894.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/uua2enamq2csfqj5970qisn3qg/2491320526.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7312b0f66ad563536345990f488d2a25/78412287020.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/33152384602.pdfIn PDF document text
    • https://aedwea.com/upload/foto/bepemikuwilupasufiwetaxum.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/df63a8143a858d2036931d339e23275b/44961468129.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/nesutavatu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608824c0e55c5---vuzumuveji.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/77321465147.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/ruretabezomuzowiwu.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611e99d960090---70823366547.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021061321414870554.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/nepuporivu.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/rozoliradazatipapirafamu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161192eac00dd4---dagijepagaki.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16078fa5a682b4---lezitipoxikadowedekejaf.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16233161565186.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/xolupejoputodu.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/48050738487.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbd1302d5---fetusisifipot.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/ropazobalawipawe.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_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 10692 bytes
SHA-256: f09ffc6a891ed8d08a2b3c48923eafbe5680cce093231cdd74275bb2794ad380
font_02_sfnt_off000110ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CE 18132 bytes
SHA-256: 18d3084f1b6bf443affa7ab7ec49b8dec46f39080f3c3146bbe2d61e97f4cf13

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