Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1527a9d8b2d7fb…

MALICIOUS

PDF

95.2 KB Created: 2021-07-30 20:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8e1510031ab269b5eacd5a0bfbf930fc SHA-1: 4c1c3f1358bc715696cd2523d0c12f5b3b5ce593 SHA-256: 3a1527a9d8b2d7fb8c16f7bf9c452673dedff2aab3cde406d813c9ada8e28df4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely serve to redirect users to further malicious content or phishing pages, a common tactic for initial access via spearphishing attachments. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac1c263f8---lopow.pdf In PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/zimelunawo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f32946b3fd---52598231260.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dovuzosixobilaw.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c72f045afa8a35041feec1db564ee64c/pelozoxi.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/vrjb0mn5kruj2t6bllsueec58c/39769164648.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e01f39e35---77818726905.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/8795972429.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1378f0b5d---57073849468.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/14287691714.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/99273908202.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/wogewozu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/39b40df74aa66a704980fe84cf3258a5/wiwuboj.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/vezixagotukemiza.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c485c396060---38974199257.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6bf25ca1---1196190757.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607681080cb33---37798621167.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c16bf55094b0fd8bb27148a4e385b9b1/91295146645.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7anjpiq9td36ckrdgav0afjht1/37029888741.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941ec1414f1---varipuligamomol.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbd39cb4e2---73589135374.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/xegukad.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/91942663494.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021716648224903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=why+does+my+hot+tub+keep+turning+offPDF 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_off0001126c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 11176 bytes
SHA-256: 038b816fc222ed28f6691f9a4832321cb67f1cc78c65be91f6241f3adcfa959a
font_02_sfnt_off00014403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14403 16520 bytes
SHA-256: e468920418397d8f0698c4e3ade419549cf0f056ad7f22bfd6bd9d32ad61498f

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