Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5824d2aa92cec2…

MALICIOUS

PDF

77.5 KB Created: 2021-09-07 13:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b48dc7c72f4775a15bbffef85089415 SHA-1: 92442c70e13e21e0f1acaf0ee1a61288c45914a8 SHA-256: ce5824d2aa92cec291dadf281181e5e4ba6e8fbf59584d24fd58e6bb0d8032c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=past+tense+verbs+worksheets+ks2 PDF link annotation
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cde05c5295---84040452886.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a24ec61b6---vodatewebi.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/034f91c034dadc4415601ec4248d886b/gofube.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c92d0f02a5---wugujesakevolon.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d28b64204---mutiruleraparisavasiz.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/9229334360.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/nitezivugetuwemali.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/59994279834.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/72663127011.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9b9df8b180531f2d1f41ad5adeec5395/zinalizax.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/46966027172.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/nusizenunulofuxipubi.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/vakifipuwez.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7690c1405---68104159316.pdfIn PDF document text
    • http://carszana.com/image/upload/File/77753180189.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/nufus.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/37722761693.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/20382450574.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gegamomamomuzupopere.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/35100714635.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/nijenixorotukusizuveli.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f1c93376a585f51ded37282ea14dce3c/75153998790.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_off0000cb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 17316 bytes
SHA-256: f98e4ea899d9be4e0d9b34193b2ff0dcf4312970508aebbbd0713c6d14aed4a7
font_01_sfnt_off0000f7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 10572 bytes
SHA-256: b655797232ba32194198b44ac1aeaf1ec9e6f797f7ae745097a7201759e7b93c

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