Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab59c5d5417e71d4…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 01:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bc2e52ba14352e12197103a3dbaea00 SHA-1: f36858413563a05dd59262fbefdf5ee60d01c7e7 SHA-256: ab59c5d5417e71d4c73f5bf9f7f9da8c427ab75f07ae541e6c571042918cbbfd
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The presence of heuristics like 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into decrypting a payload, likely by providing a password for an archive or attachment. Multiple URLs point to potentially compromised or disposable hosting, further supporting a malicious intent to distribute further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hongmao.tw/uploads/files/202109192115024428.pdf In PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/87472712519.pdfIn PDF document text
    • http://cascad-trans.ru/files/zixada.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/89055362973.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/jujosezelotimexegere.pdfPDF link annotation
    • http://invismortgagebroker.com/images/file/rukef.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/dureja.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/jakoxiwotok.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/90555542963.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/84440743972.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/butolazozibu.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/53603526917.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/65763122070.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b7be56be9---dukasitu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16149052188326---modine.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/59361526982.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614770b7a3acb---24870032715.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/tukasiguzasijujirup.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/746441dae4b361c0436dbe4f4b58bbe3/8496437756.pdfIn PDF document text
    • http://furniture83.com/upload/files/sofiki.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/borisegu.pdfIn PDF document text
    • http://peoplefoster.com/pliki/wipod.pdfIn PDF document text
    • http://chirineli.com/img/lib/file/48990058377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=evil+twin+attack+androidPDF link annotation
    • https://mediaget.com/userfiles/files/tejosufopax.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_off0000d7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 10288 bytes
SHA-256: 5cdcf8862776ef26b7e2331e7f6e74a89fbc4984592e7ce14ef37b0175cd2d24
font_01_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 18444 bytes
SHA-256: 12730d386debd481acf31c0abf2653a074f679eed48bf91649eb31750efccb1e

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