Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afded6cd661d732…

MALICIOUS

PDF

88.8 KB Created: 2021-08-04 08:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a92828cc462316e317823686f1a2e244 SHA-1: ac29df5a4417f333718f40e78c333876862165ac SHA-256: 3afded6cd661d7328038ebe5a21c180473e395c556b118d5c269bc6167aac814
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Additionally, the document exhibits characteristics of a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. These factors strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://ofertaromania.ro/ckfinder/userfiles/files/77313995050.pdf In PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/57244642398.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512075353981586.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/31549739451.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4a27f59d509f6419927c7b005328a657/29527102776.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/3718186711.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/robokedixokunujikobufero.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50f9702a6---nogurelekisawa.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/39171273509.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/28616909709.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/92890794826.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/60188237470.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/90738826353.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/5167391174.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/96732598618.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ade3be4a4ec---nuzegetumekifezideseleje.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/f7im8r0gt3rr2o8d86aem93ehe/61410365496.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160870444030ca---24059755338.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fd43a18e6---36261146631.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12f1b2ac7---muxare.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedd57c51a1---6090787932.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/jowowifadiwe.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/13513134390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tom+and+jerry+the+fast+and+the+furry+dvd+menuPDF 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_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 17032 bytes
SHA-256: 9c4b77df465a52bde7194f1eaa5b596451c026c64563d79346751d722e3b479c
font_01_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 10856 bytes
SHA-256: c570bc57257a2b9c64ad53a6b1f37b5c76023c83d335316cc0b72cec5ae0038b
font_02_sfnt_off00013bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1