Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac0f9733b8a8d26…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 11:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19b2392e81eb5a5d78f5a887120fb1bc SHA-1: f749767284deaf1d5ba6ea069f972eedce0f9abb SHA-256: cac0f9733b8a8d26a8a2de90eb58674fed3e88502522d92bda5f28bda1208e58
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/tibusefezomuzinipatesog.pdf In PDF document text
    • http://www.como-grup.ro/fisiere/file/74316206209.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/fipavapolagigebolow.pdfIn PDF document text
    • http://cochemical.com/upload/files/diluxisemajojer.pdfIn PDF document text
    • http://a-pluset.com/userfiles/gojesefakelazabevexiw.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/82649301869.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/39082608652.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/40293400441.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/1176700001.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/migapazilarepifivo.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/tobawunetipifeze.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/65660159273.pdfIn PDF document text
    • http://bulmarconsult.com/files/bedapezane.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/devumew.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/df231be270f4ebb9044af47b0b1dff2f/37734838532.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/82532706650.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c53b64594---welipaxamuxelif.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/fipuxefebejavuleze.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/19oa6m0d64tevn9b1pj8p9mf2g/11389816550.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/84957591728.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/35367471297.pdfIn PDF document text
    • http://recviem.ru/img/upload/pagupefifelodobin.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/43334217030.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5c1042068---59435465013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=among+us+mod+impostor+apkPDF 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_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 10732 bytes
SHA-256: e55157166dea9697c39dc7bf01219e0fb11f681c8414285ab8f2712d8d0787b9
font_02_sfnt_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 17556 bytes
SHA-256: affdc7822bafa3d178cba1eb3f6ad7d38399bd2485a780ede011bcc71c7d1ed6

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