Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da76e84935a6800…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 16:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1dd1288f69556d050802ca74d29d7df8 SHA-1: 34a2ae43fff26fc66dc76984b6ecb91830a5b6a2 SHA-256: 7da76e84935a680034ff064f73c3debb8f13e7fb2c03e0ab71d014d434f899d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains an embedded JavaScript stream and numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of JavaScript indicates potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=ac+milan+android+theme PDF link annotation
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/vowusizopapegitab.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320d4b365a6---zufabavez.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/86613138034.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/69dac69779861e273c6481357a737e5a/89454799810.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381b2e98da9---67888864411.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/93072028049.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/18098652164.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/xadop.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/31572809024.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/96748263474.pdfIn PDF document text
    • https://network-italia.com/file/61160576158.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/gubopupelibakamux.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/fb693e7cb47751d2bb7b5fc40509dfe8/71413044826.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/jepaferanokulipip.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/kuseziz.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5bbc7869---dakiboloxotafikebat.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/28963484154.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/82068446240.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/95406068791.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e04d96418a29334289595a9ca87b60db/18571006219.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/3945262427.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/buwiwimera.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/kakutuworu.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/92810825587.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613001d816d9e---busulubeb.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109041624058250.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/tefupakatoke.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_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 10448 bytes
SHA-256: 1d6eeef7e47b900153d501b88b7e1685861334887890d3bacbe7e942fe93edc3
font_01_sfnt_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 18600 bytes
SHA-256: 424afbc0fbe39fbc64f1ae6dba204db6956184001d0d131c9fe31b67d8d39c4a
font_02_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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