Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d3af0517829cbc…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 21:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b31247848504beb9a1ae5083c8fa890d SHA-1: 2f3961455ea8c7319ed13035d5d1a228a0a674cf SHA-256: 26d3af0517829cbc6cdd00084d4bb901cf7f1709bcfe2bc64922751174cc8424
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=how+to+get+robux+without+paying+money PDF link annotation
    • https://zzwgjx.com/d/files/38160529898.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/gewuratuladifavap.pdfIn PDF document text
    • http://jawarakreasi.com/file/26385315897.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/8701831811.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/48323840687.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ktl56pnhbg822ou54klqc63ip4/javabagog.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/fewogibipavegej.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/70859918849.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/vewelamiwi.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/turixelanafubuzigix.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/77302755019.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/digoduxepuxugal.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/gebizotuzitukuxukelidade.pdfIn PDF document text
    • http://secretinvitation.net/images/files/vivejexuvegojaxozoz.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137011c923fe---bazorusip.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/durapimala.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f74309d4b7---47639718956.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/14497402541.pdfIn PDF document text
    • http://builderall.info/userfiles/file/xinepogafelidejelimu.pdfIn PDF document text
    • http://schokobrunnen.com/idata/54590147508.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/30469073856.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-6/20210906064740588219.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/65939372265.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ouhg352t4uahe2b82bqib7ono6/juzeribigabek.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_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 18584 bytes
SHA-256: 8fd6711c8a8bd0be55aa037809e3befc62cf54075da330ec3606dfe6150bd1ca
font_01_sfnt_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 11016 bytes
SHA-256: 7d4d6f86c7cff4550887678be2fee2319c6854d7d01a87a20426381fd49868e0
font_02_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1