Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4c81b66d31b60a…

MALICIOUS

PDF

86.7 KB Created: 2021-07-13 23:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 36ecd8334eb5a9f70dff99bb08e1515a SHA-1: 22814ee21360b46bf471c9f9a0f68c4e21926ba9 SHA-256: de4c81b66d31b60a4ce5d66bc57937e6b808d858db2f64dda52a82fb8ce0c2ff
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised WordPress sites and other disposable hosting suggests the document is designed to exploit vulnerabilities or redirect users to malicious content. The primary attack pattern involves leveraging these links to potentially download further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=organization+and+administration PDF link annotation
    • http://siltherm.com/ckfinder/userfiles/files/75870586355.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba4f48373---92975952782.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/pubimo.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d450287ed2---16734122284.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/i7rcu98mghutlf77ogov23evr3/kozubikeduvavefunuvaviwo.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0f4665abe0b3926e9d17390d55042f40/98783846716.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/69771730416.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c77de6ebaab---67086606004.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zolunavijufirowupar.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/wixuxedalipi.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a537782f836---63915349081.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/rezugajuridotege.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c5021fded---puxov.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1dbd3bc2694fabf571602d45866ba6d5/93250467568.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/15404964401.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/b850dababc642c9745a176ae4fb77bc0/17483056025.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b6185d6152b8d82e4cc79fa4c4a64097/4896708767.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///99249992304.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd5116f7a5---wijedenalad.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/km15dkoiqp8lcp32vpfms9rkh0/dimovotadex.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/57709028395.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/nufikodevukibilusova.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/dt4c8m6ftufb2gduvjc88bfj83/kojadufolikireror.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7d21a7f073c5cded35a3afcc6b689b9/57067207005.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_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 17188 bytes
SHA-256: 6ac9f00c8b9785de6d614e152e4887136984cb1f48a555c978ec97e8e9a31759
font_01_sfnt_off00011dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D8 10500 bytes
SHA-256: b8c47774ed4b002740f9992eed9843f053309a5a39d466b28f69df19b5a4669e

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