Malicious PDF — malware analysis report

Static analysis result for SHA-256 588d4c4e5189b7cd…

MALICIOUS

PDF

88.0 KB Created: 2021-06-27 23:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d6c2d46f71c2c628d6e7ad29b45efce SHA-1: 37b12a2b48aac2652a9fdc3eda2dd348faad7d5d SHA-256: 588d4c4e5189b7cd0d843f9a1ad8643a044549591b22a87daf4b1dbcdbeedd64
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress upload storage, identified by heuristics as a potential phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781ef1a6073---91441051262.pdf In PDF document text
    • https://wrd13.com/force/file/jizugowutemitak.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b88e47713---7962846090.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/5676862877.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/bonemimodimawanupitubari.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/99999829353.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3692b66d6f---41590983437.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/zafemaludeto.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/bb2a76kdnj3u5tfffe5rckt5qd/nerepelalegiwuwesosavasap.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/46027192434.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/zefanoravekiriwuxoxovija.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/muvowevon.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3d8468576---lobakub.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1fuj50pv6q8fqstqkqui83inlb/77310313237.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b3fe15036---81529153207.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/54654250109.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d81b86db2---pesuzu.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a8fe8f32c---madukaxawumogava.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/74504826800.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/jubobulimamozigig.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/75548840736.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba74de54e7a---775639527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=out+of+office+message+vacation+examplesPDF 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://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_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 18444 bytes
SHA-256: 25b2f0532f69a1bc958b0deaca3ce2a0d4043edf08a2d1f7a84179819dc086a1
font_01_sfnt_off000120da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DA 11016 bytes
SHA-256: b03936d2e999a39685007f4d5e9aa416db7496694c8db4b4dc70639bbdb907bd
font_02_sfnt_off00013a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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