Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e16f95c3cc2c53…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 20:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: be8a06158601ec944fe8e15f8cdd3327 SHA-1: 134de8e9201a8d066bd943f7b5cef16ba60f0cdd SHA-256: 21e16f95c3cc2c53569b170fd86a5ed781731e679ef9ac6aef7fbaa5b00c648d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites that host further PDF files. This suggests a multi-stage attack, likely intended to lure users into downloading malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ketchas.ru/uplcv?utm_term=ncert+solutions+for+class+10th+english+chapter+1 PDF link annotation
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d66f5396a11---20135193437.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/silala.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/lotusozerakor.pdfIn PDF document text
    • http://rayer.cn/d/files/48599835516.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c77ba684997---fosikibalodufawaza.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a303469c4dd---27282527282.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/junasajuzumidazekamexi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160998297a647d---lazilagelapomejojibik.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070bac780be1---30754651319.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/th1g0b7gqvsmbjefhm3emnk4be/91789143474.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/67584918006.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb53fe3a580---luranev.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d4e710534---73018311438.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/2nhdac2fevfuqljtbsqt2sfbmr/4905208995.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/bu2eki882u76lf4rctgbff2miv/94174471879.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/55962506713.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764aa38f3d9---ketal.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094d50313655---xigoxepuzidivobelo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097460e0ca5b---welilidovojisoruv.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/03983658912f74bcbc741c825983a067/webudolusizesalol.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adae19ed591---61192484326.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/xujisimikumabitunonus.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_off0000e8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 17260 bytes
SHA-256: 8488b0b61457278cd4559c8f2e8f7ecfe984a857f2531c8a9c68c30f6e5c3182
font_01_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 11012 bytes
SHA-256: 838be91e8d3424906eb5dc8f6371fcc72b0db340a648bff0cd1b8afd47807956

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