Malicious PDF — malware analysis report

Static analysis result for SHA-256 a533ba588650bce9…

MALICIOUS

PDF

75.2 KB Created: 2021-09-22 19:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 639f6b34cc00c22c26021520ee5db8ce SHA-1: 599a16bef0f4f222066d9b3797114503d00f6833 SHA-256: a533ba588650bce909a71e3ef27f38727ea18d3bf29ce6432d41491fc4965518
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick users into providing a password for an archive, likely to conceal a malicious payload. The document also contains numerous external URIs, including one pointing to a compromised CMS upload, and a link farm on disposable hosting, suggesting it's part of a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://pixomot.ru/uplcv?utm_term=launcher+ios+13+premium+apk PDF link annotation
    • http://armanetti.com/images/lonetadenutof.pdfIn PDF document text
    • http://ombs.ru/uploads/files/sazuzid.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/1110836987.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/pololugivomopami.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/wuwanejuruxareg.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/gidofagewowopo.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/69237114309.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/36087123234.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/83426512523.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/95276613708.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/bazenovu.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/94580107145.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdeace22b4---dojobexuzedebupis.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/63166629125.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402fec18acd---73743171793.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd6eb9113---64018146147.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/bodoputelozufexa.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/xaxevijusomosevetata.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/48658639926.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/51666489947.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/bigunasufibumumal.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/76825683985.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_off0000c1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DD 17208 bytes
SHA-256: 33f25b3c895f975ed44ec935f4ee489119b523b01df815b26df261ace07d5e8e
font_01_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 10868 bytes
SHA-256: d227618cba2d9c23848ab7c263c7211c152c872d861dab2fcea9185e89065903

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