Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7e32e200e5f621…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 19:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e836f13f0428a4b88387d64c2e2e51c1 SHA-1: 1e5c2e012852b158c380dad040ce047a98b70067 SHA-256: 3b7e32e200e5f621a5122e063ecf9aba8d80a10ce136e34c72d15f5b88372e8e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ijpdua.com/contents/files/49464451316.pdf In PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e9ed71fefce278cec2b9ec816c0e6d66/92356025735.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/bfb1580805303068872d0cebfdde5ca4/47466600188.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/fegosagopiteduj.pdfIn PDF document text
    • https://zold-kommando.hu/files/nurikamoxetanabus.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/ludaton.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/gasajozemeranulor.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/xudosasonokokanaxikiv.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac3497c428---50886856288.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/dubozusofudidasago.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/462a021e7027cc8e3e575ef0fb5d223e/xupowikezup.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/vokisazojusamawetil.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/jigunopizelajakupujid.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/27589483099.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6d0d7de7ada4aef814753873d619cf1d/topigupuzoredikuz.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/3d2c19aee9c162fff5738005f199fa78/78383074418.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210719162306489190.pdfIn PDF document text
    • http://dnepropress.net/files/file/fotixoxowozojudesufoduj.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2b1accb310e736cbc14e6abff696458a/redipinikibu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/64bf67e910df4236061f43c257a7f6c4/giwivo.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/61583638460.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608229a4a8d8b---banokujaxazi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/du0nvuae7i8h5989gf79uue7cq/71175108333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=george+it%27s+over+declaration+of+independence+breakup+letter+worksheet+answersPDF 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_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 11456 bytes
SHA-256: 0464de93ce0732479c867e03dc0834d923fdbbe2e38880e0a6ad972e75eae6b6
font_01_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 18640 bytes
SHA-256: 2a198252350e6b7368ec3e884f980a286d9cc0bcb41854c19f1da807b4eda09e

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