Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d851e3ffb8e002…

MALICIOUS

PDF

92.5 KB Created: 2021-07-25 22:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0a69ac48df79a05cdc69d083ff38c9c SHA-1: 173d28f1a45e7e1197a46eb8961fc5f8b2081bce SHA-256: b8d851e3ffb8e00257e387e88e0c33952dbdd761ad930c22abd59904b5518dd1
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dahchen.tw/userfiles/file/korikaxelujoxasisiv.pdf In PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081585327bca---mofinetikax.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/fipuwilefibelexixebisuruj.pdfIn PDF document text
    • https://bloomeng.com/uploads/4162723627.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/25240281477.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/mumoza.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9d65fa4371df4aa6b6ab0bd557dd26be/kolos.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bed55ff83---tapowefetixo.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01bad70975---lodapobivisisazirafafi.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021062918441170554.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/dojaz.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/pepozulubowugifosafuv.pdfIn PDF document text
    • http://linker-apps.com/files/mezavirupiwowosededikon.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/3477415046.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gr28haudog0pak7e9f1ssb1d08/18706993446.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/03anasl804igq9mmcfboer6ibt/81275106163.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/udjide1keg1p5upr7khracq7ke/lesapimasosagek.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d257e5d8a9---wuzawofimuw.pdfIn PDF document text
    • http://wawa757.com/uploads/files/15910476222.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/82912417318.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a89bb08ca07---goninutuvosumuxagi.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/jurexavujekafutaxom.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a590fbd1d74---xifizimevudugezifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=creative+sound+blaster+x-fi+hd+manual+pdfPDF 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_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 17336 bytes
SHA-256: f489491ffda1aca898b4a7fe48b055cd71672edac06906e372781bb8955c6638
font_01_sfnt_off0001316c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316C 11236 bytes
SHA-256: e52dee988b3622200bcb21b6e5973785daa4d5e14782601d3fea6ae7d1bd7ad6
font_02_sfnt_off00014b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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