Malicious PDF — malware analysis report

Static analysis result for SHA-256 76cb35919227311f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 15:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8fb23dd1b99c1a649ad816cae9f714f0 SHA-1: 0c4151b681e026516060fe90b546248b486fa594 SHA-256: 76cb35919227311fe81f4426cf19465723a18254d31e02403d4efa8ae5072dc1
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to lure users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=contaminaci%C3%B3n+ambiental+pdf+libro PDF link annotation
    • https://scavilecis.it/userfiles/file/99342484176.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/vekiburukomujos.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/19336319715.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609109ba05cdd---dirulibujokutafevo.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/kitumisivafij.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/f43135c35afa4089e65c4df5a6b05a9f/kudozefumolupi.pdfIn PDF document text
    • http://djpress.pl/Image/files/86167496566.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/49332190009.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/sebavesit.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc4a933858a---31395995206.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/10741600095.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/92a37cb5ed6ebc9a50db5b24b881aead/riwumebisibubiru.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/5287093569.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf44769773---kuwazokewan.pdfIn PDF document text
    • http://nova-auto.com/upload/tumotiv.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/50262682271.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d36ebe14987---bupobuwedojiporefekamatu.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/rirusewuxasapigofe.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/11188346575.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/wuxegufowigor.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/jawivedebap.pdfIn PDF document text
    • http://learningkey.org/userfiles/wibunagunuzabosasip.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 10924 bytes
SHA-256: aa7558eb915aad498b95d48a7171e93fb74c44bb345200e6f0aa60b75704cdaf
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 18592 bytes
SHA-256: b811cc7033be59f6849f523c2a8ab85c0a8a5bf8d4c6c14ee47771e13eb4894a

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