Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2c12920bd4e877…

MALICIOUS

PDF

85.5 KB Created: 2021-10-13 00:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89eb6190ec5e0b065026f3b955613be7 SHA-1: 1501f32f2dac465abce722f21262fbee81ec7d09 SHA-256: 9f2c12920bd4e8771693d5963e5d819557aea237e92a593c110182e6416e71ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://inwebjor.ru/uplcv?utm_term=flowers+and+co PDF link annotation
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/nimilekowopiwozi.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cp0fdh1r3ht64bm5jpp3hq78uv/mevaj.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/31793653735.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/91382120715.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/jejasimodunuzapivutowu.pdfIn PDF document text
    • http://dges.in/userfiles/file/jejerobofupirebuvejaw.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/bogipopizegi.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/jiganamovipufenilaxijir.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/dajaxar.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/webamidanaj.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/19927193774.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/lomop.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/fdb32b05aa143d1f5d3b0909757b4223/79724052022.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/fusotexo.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/zozujoxubiworoguv.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/87886238818.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/pufowovalejanimemupi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141a766ddbf5---82365763137.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/12030476897.pdfIn PDF document text
    • http://efrex.cz/files/file/79857213372.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/59100495973.pdfIn PDF document text
    • https://kysig.com/app/webroot/userfiles/files/nisijuzugajowif.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d89f9eace9883bb7c97ae3ddbc1e5c99/kozilizufanomazen.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/6516906421.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ff9d17024d---dufirutejosafaxawajixo.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/35360042581.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/94217527336.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_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 10236 bytes
SHA-256: b7099b0d81ada88005404f4cdfef07c7fcaabf8e98d8c2116e6afd11007c1441
font_01_sfnt_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 18404 bytes
SHA-256: 7a96c59505443171fbadd9178c1ce05518e5b924592bcab78ebe463b6aeba861
font_02_sfnt_off0001309c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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