Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53ea19892a922ae…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 10:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83f108287d3df50115dc247fec3a4150 SHA-1: aa236aaad1c274d1d2d6c647f91557b368e9b9d5 SHA-256: e53ea19892a922aebfa670387ae541c8ae93c5a057bb99b4213c23aa5c4bf94c
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://infrive.ru/uplcv?utm_term=python+code+to+convert+word+to+pdf PDF link annotation
    • http://strahovka66.ru/userfiles/file/35355287482.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878393d55fa---15082304814.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/puxigikuromupumelivewike.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/80004853765.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bacc41674---88639512386.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/24739846147.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16076a0f63995c---gagixipejunukalogawod.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/98378578754.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/29414295147.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/xadawu.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/92727814080.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/8vnq7p02n4m4ci2gk1uo094s5q/faxinolavupomefugupe.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/13607852555.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/xovixoxagepuxikaw.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/zodalu.pdfIn PDF document text
    • https://ive-cal.it/file/19578169967.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd935e95c9---80868965315.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/bakoladujero.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/gitidekos.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210902030423_rlxhe7.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/66759184403.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d728f77d098---9584156630.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/59aff87c62370802929af1ef8edd9229/78858984240.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/91948902937.pdfIn PDF document text
    • http://topas.lt/userfiles/file/subefubeguritamixixune.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_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 10516 bytes
SHA-256: 5d97933893ed38350e84a4b8edd0869b1bfe4533559a68db549fc031eb0ab7d5
font_01_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 17452 bytes
SHA-256: 9242ce45595cb3557b7e1456abe3794d0c5dbbea3d44ea81f12873ce8ef78817
font_02_sfnt_off00012228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.