Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9ce9a5e4a15ed9…

MALICIOUS

PDF

119.8 KB Created: 2021-06-16 20:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 00bf6fb7aa83936fe805372f6f8cb954 SHA-1: 2e9a13290cde9ffa3a0a3a1c0549718485b325a4 SHA-256: ae9ce9a5e4a15ed90bb68ceb162d3069e93159872349853a80682f104e44d918
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, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload links suggests a tactic to host malicious files on seemingly legitimate but compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://crewmak.ru/uplcv?utm_term=armin+manga+aot PDF link annotation
    • https://bcbc3399.com/upload/files/gixukexonawiwenolagefako.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/413f9a7dc18c345d38fe7f0826b9c152/robeduveb.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc208ca5f77---8317082583.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/95903634386.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/49267812489.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/27634607908.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8f2f5c21b---30123080396.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886f4055ede---93671819030.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2aa9fb4aae5e7e92ea5a016ded05c6ab/walugirusijizu.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106101035056280.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087cd13ea0fc---dorikufozizesebefakemosop.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/35648526525.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983d064dc57---dinaxepobun.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081583c96d35---disuwoximixosabuweside.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3824a36dd6---62500453536.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/71b6bbcae4b9e8a42fc2d0bdf92f99ae/wazewabawedosasonojasoxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18444 5160 bytes
SHA-256: 4f8933ec9ecba64c7c15e7b3f9d73ef66a80a33d6b97edc80ada5f6ccbd44da2
font_01_sfnt_off00019659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19659 4784 bytes
SHA-256: 2fd1cd7777038d8544c75743a81cc7de96a39f919e4748dcdf951dbd307c2ecf
font_02_sfnt_off0001a688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A688 13940 bytes
SHA-256: b17631134d4ee56a9031b7fcf94ceeb768a5d710c1860f92a2612b1ef4f32bcc