Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0c9cabd0558bd7…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 16:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03ec0c908ebecb216f7e4b2502bc2031 SHA-1: cd5e3b88edf69364fb1e83c28a2c17ab3f88c52e SHA-256: ef0c9cabd0558bd7a357aef9a833660f110313db8669ebd648a6f6112f6869a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cmorshomecareassociates.org/uploaded_files/userfiles/files/37657903887.pdf In PDF document text
    • https://artenika.pl/fck/file/26596270063.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/7dj359g2s9gavg35h2s57ct3mg/zidevola.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/vidizagofovuvexeg.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cfacabbd5---kobule.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e23974b80d---nemopik.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/nikeruxuwofimokil.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161377a52affbd---37953441209.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210914110029.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/1579396571.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aca0b385182b1a8abaf90b92a421adde/lotafajazir.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210903210650.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/mufaju.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/82513920539.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/32157056809.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/45547012823.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379fbe4ae72---kajebiwiregedunaguge.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/wigikatekopunizejajefev.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/35265919861.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/zeluxugazufibogowusuwodan.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/zelusukujuzatibilametutu.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/87159737130.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/50546008897.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/kamunewikakazidodiwinal.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133f7777ff6c---bunekudeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=iphone+stuck+in+data+recovery+modePDF 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_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 11056 bytes
SHA-256: 556e3313072333fc00dd7f0849011fc91aed2f3db41b85fba449af19ff6c9360
font_01_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 18296 bytes
SHA-256: 063daedf421b5e9904740c10c90092e9802c4a1c4b7b7f115f4f0c00f6f9c1f3

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