Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4923695041ebd58…

MALICIOUS

PDF

90.2 KB Created: 2021-08-31 00:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 97418128110684f1c0dd65512db6f8f4 SHA-1: 79ade2e8b2508d3bbe6ea8e6595116dbf8c5b5a3 SHA-256: d4923695041ebd584f9a3216f62c17433229d1c730259d0f9e3ac98f03dfa735
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's upload directory. This suggests a tactic of hosting malicious files on seemingly legitimate but compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6985cfff0---xegulu.pdf In PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/vapopotarofejulawumufu.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/77809511484.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/66614462916.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161044e0dce6df---13185847794.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609047ea54b84---52839472929.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/namotelufujot.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/92522699948.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a4a2ba93b---99296353268.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c78bfac9280---kowuritari.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160717a401af4d---tefojijume.pdfIn PDF document text
    • https://sanidom.pl/img/file/nexifipivotaxakagudumudud.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/losuwiguliz.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/gexilunigusudixapabegojuj.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfcae9d390---famerosigopud.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0235180001623959577.pdfIn PDF document text
    • http://wohingltd.com/userfiles/lemalunovitezabobu.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfbb8e0b00---82941284650.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160798f139b8ed---3190156208.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160955d6664052---89624693950.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/44655712144.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/jepinebaxusebadowaras.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/hfkqs2skc6g6j6q8mnrn999b4j/48598513204.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/forafelopapam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+2nd+greatest+commandmentPDF link annotation
    • 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://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_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 22256 bytes
SHA-256: 846a64c16bf1e2f48922f163fb483ffd9eb2550756a64776080f1b8e9b7ce525
font_01_sfnt_off00012d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D84 10764 bytes
SHA-256: 4f825546e3da71d80e0821f747cbb037a6c212966316832c1960b02ea6a6a032
font_02_sfnt_off000145f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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