Malicious PDF — malware analysis report

Static analysis result for SHA-256 0668f6ff6f827422…

MALICIOUS

PDF

86.3 KB Created: 2021-07-02 21:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aa5ae2bb11084c05e3abf93dbd8c7970 SHA-1: 3fcf3e77f6d92def7ebe14ccbd9cc435bfba9e9c SHA-256: 0668f6ff6f827422999948e16961faae2a389a131c75207031a7d549c097aefc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, hosting numerous PDFs on compromised WordPress sites and disposable hosting, likely to distribute further malicious content or phish users. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true origin and purpose of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://tokyoracing.hu/userfiles/file/kujozisokabaneguzisux.pdf In PDF document text
    • http://blatt-gruen.ch/files/67669629435.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/05916ba574f29f59e086e089e1ac1f9f/4394048442.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/kodabazoxetew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca0dc00f8---63101144444.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/wagazi.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/2cd32684f4b516a50b176501e8537f57/91830538118.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ee8rn1omvo8374mfj48bfc769u/xatinira.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/fipixudupativafadevosi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075f01eda358---xumafozixalumeluvedivat.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20370324671.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b63554a4a7d---nifenapadesasezenufojage.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a91f9150d2491a8db661ba8ead3e7492/xiwepuzem.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/rarofo.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/nikanunadakadobekevolem.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/3ab98b6b44777c27efde788640c808c4/26258352990.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/4sh4iuvgdngvhq16d3badfkc7p/57281610072.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e8fcbd9fd85bf520c5bcb79605e11bc3/womakijotunapifisux.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cb09cedd864e4a313ac6c2a1390bc75c/63412783372.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f89ba748---23753476788.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eec5c31ffb---kulekomavozifubax.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760329524a7---modetupopipurekiti.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0d6a506a---xowijaji.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/68067487289.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/45191679574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=common+foreign+phrases+used+in+englishPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/guzakur.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_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 17852 bytes
SHA-256: c2f7e44bb5803d969d8d36ded1d2d3e7f644f4ad02771907e9b1d7a56fb47013
font_02_sfnt_off0001329c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329C 10980 bytes
SHA-256: c340b554188db48f61c82ad5ee5b6e0215e366f63f0e3f883ef7e9d5707ed14a