Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36d8b7bcc62c51f…

MALICIOUS

PDF

81.1 KB Created: 2021-08-02 17:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab3f10a5623ff4afc82add9327112754 SHA-1: 1dcca07b395ea579583392cb84debe1af8ecd4f5 SHA-256: d36d8b7bcc62c51f4bc2ab979dd385df82fde05a6334ed666c41974d5c927c34
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a lure for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=the+royal+order+of+adjectives+answer+key PDF link annotation
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/e8b708b384cc5335c43f833b432c08a7/kuzenovuzopa.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084414de8926---nabitodivazupowi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aa972d900---86803642977.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/72c23dade20cf1d394ec6b44c8468a72/kifege.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/tavujixajodibipe.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7f71eda2---donuwolapilipipumeraza.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5126e286---76822735677.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/90914744930.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c155ace5a16---26093949126.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/xamenewazapupitalibijezi.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/simasuzujekimemuzi.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/xudezumazi.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051310222689.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3dad48a7a---fofuwenil.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbcb2ce1b95b602d4c24d34e01c5ba81/4725155361.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/29pdgaa9inj7rou4klmvamar56/86983368129.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b035f914c8---72006499064.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/lurebajumotajavus.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/34883307862.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/lawoni.pdfIn PDF document text
    • https://motacademy.it/file/86200192102.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/bitoxunarojegagoreretep.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/r9o02m54u39q0vf1itvgu702pp/panimovijiwuwobuze.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/13372273926.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/70506608c992952ebed644cd8ac125e8/51536360880.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_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 16808 bytes
SHA-256: 5986a16923d713d01efc6c3dde30c0c6377c5222b753095cee2b2d3a0bc29431
font_01_sfnt_off00010339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B50 11024 bytes
SHA-256: 5c885e99bf4edbbaa85805cecf2dcee1ace0e0a7e1243785475dd94cc6e9ef07

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