Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c8eb958ef55b3b…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 02:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b212096d85a41e988179a3a7d5b7a939 SHA-1: 55fd0a3a8315565643787abb11d3be0113e711ce SHA-256: c7c8eb958ef55b3bda4052cf9e8daab326322cf489c43c6f60457d43478bdea5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jedzenie365.pl/ckfinder/userfiles/files/wapiteregu.pdf In PDF document text
    • https://promenade-perpignan.com/userfiles/file/digemukawozuk.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/96178349666.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/wajarufatekukij.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/70038743089.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/99499514400.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/64001006654.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/8160284574.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/pibekovajafefet.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/xavikidowikoforafineju.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/76454745719.pdfIn PDF document text
    • https://uangraja.com/contents/files/3942041899.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/xidolofezapel.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/10246976292.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/pajojodiwotetabuwapa.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/4q1meouof9e1k60g23g99u6se7/rogagimopemuvojelasi.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/84871816491.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/dovedabinokasulefoz.pdfIn PDF document text
    • http://sartor.ru/upload/files/vijinovum.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/opc4uca91b9m9hu3t43npvlgi6/robufasogelide.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/868c88613084d1cfd7bf8fb129952cc1/dubuxomirejofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=aplikasi+android+penghasil+uangPDF 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_off0000af59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF59 17028 bytes
SHA-256: 31ed6b27a0448958a3c72c7cc55c9760a28305103373b7b7ccf84a944e3360c9
font_01_sfnt_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 10744 bytes
SHA-256: 6f612e36343f8f085138b486217fdedfe32ed8554397f40fbf816bb19bad5f8a
font_02_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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