Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f19828c7c0ea25…

MALICIOUS

PDF

72.8 KB Created: 2021-09-24 15:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3e317f79636eb534e085ad2feb819fe SHA-1: 9040f3b5718a697a95acea864beb63df2eebb25e SHA-256: e1f19828c7c0ea25a477786b59efcd6b55c36df7d21a52787414c8acdb874205
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to malicious sites.

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 https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142f627d7145---bubufosodagegadutitomu.pdf In PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/1835202979.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/lobapatibixojogimaw.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/47875377207.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/juvufemoxatowuna.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e55b8ff392f19c0bd402130383d3a52b/nisuni.pdfIn PDF document text
    • http://sieuthibds.net/images/files/55703327892.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jepanazapabixala.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/534c591ca2e4332225a11c87c2731150/44238151912.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/venedilapovuku.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/42399927128.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/rofobuvodosuluvinatime.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d612079a5a---80753131382.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/tixiwilisi.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/koxilibunogimu.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/naxenujejobavijuvabex.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/73723126339.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/mitugajatinulexufige.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/37144079499.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/66370494962.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/71772989180.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/28605589181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+phone+in+30k+in+bdPDF 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_off0000b5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B3 18028 bytes
SHA-256: 4270b8424871e991f5c6ef92f1700298a478d2bb02d2a19d7bb3728153d1ab20
font_01_sfnt_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 10760 bytes
SHA-256: 9ca027627bc4388c970ffdb182d6a29c14426bdf35b44e49f87bf119a7094153