Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cd078246b38c2e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 08:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e6f08507cc8b9182d9a83c2634264f7a SHA-1: ecd23d1046cb4309517faade4d99d5c7e7e51405 SHA-256: 57cd078246b38c2ed7d5cff3211a1b49033bcc9bf3eb8b7802fcbbacea4a7b7a
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=aplikasi+vector+art+di+android PDF link annotation
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613044f4b77c7---23524539571.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/wokefe.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/sidagunasexodugol.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/60257966921.pdfIn PDF document text
    • https://hoavily.com/uploads/files/pololamopakovar.pdfIn PDF document text
    • http://eventechsite.com/files/files/32982416238.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/65991199223.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/gibusukob.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/32999900079.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/pitoribu.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/47771239994.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/77800719430.pdfIn PDF document text
    • http://eternoohydro.com/d/files/jozakonirajomomobokosip.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/31bd6f189bf3e362148a1822dc905da2/24677915028.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/46673969504.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210901195749.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/84743484678.pdfIn PDF document text
    • http://btfa.tw/upload/files/63548309988.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/91916668229.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/81259548744.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/bulekodegibo.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/90782315194.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379cad73847---nugagofonarudodu.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_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 17660 bytes
SHA-256: 6c2ab30cf8291384913443d65b838df9d5bab7181fe0a6d9afa6e4caac939ec4
font_01_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 10644 bytes
SHA-256: 5695b9b29c4affb5c83b677e2e27c0a47e5101c7765937d0b2ce205f3cff7bf4
font_02_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1