Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6768e6c445ecbf3…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 01:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8581cb3afe76ab56d14d319279d1af1 SHA-1: ee534e6179685214f2f0abf85b8d4450f9db7754 SHA-256: a6768e6c445ecbf3749b7a907f39fc7d9259278d0d05cb71dc5f4210e7f6b101
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable domains, which is a common tactic for phishing or distributing further malware. The presence of these links suggests an attempt to lure users to malicious sites, likely as a first step in a larger attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://inannamsao.com/uploads/files/xamutoduwadene.pdf In PDF document text
    • http://desushibar.com/userfiles/file/57706356985.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/92146506253.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/gonokemojevifo.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/22335269092.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/57913203415.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/45687750619.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/90600223054.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16079d7b6a33a8---nogugojarowizuniwugori.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/12kmu7l4rooibvqktv5qpirg07/2472968430.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/70876235992.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/k2lgs7egb72d4j3itcrgre4aqu/sufibegarobarufolexowifuk.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ec45e541b12f0dd92503ad4f208a3168/69626005593.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/71037400034.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/74770685933.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/63998578266.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/pafepipozajiluxupil.pdfIn PDF document text
    • https://olterus.net/contents/files/36965867502.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/muvuvurebaxoganuwanur.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/59487525698.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe4fd8744e---jekibirifeni.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/6p723c4akf58td8gh3v4q2jd04/lizesiguvif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=happy+xmas+sheet+music+pdfPDF link annotation
    • 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_off0000d149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD149 16876 bytes
SHA-256: da128d3ad7be8b74d6748361f7f4a7307286cbc8e1bfba454be4317974f29928
font_01_sfnt_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11584 10820 bytes
SHA-256: ea1aefa8b5868952fc4bc6ca48e82a1809011316ccf7e4263f1f7b2a412966df

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