Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed903331f2f497d3…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 08:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dadf6b56b845d19538a8677a94dfa2a0 SHA-1: e80c5a24257c4f8fffcebdadd381e0885cea2f0e SHA-256: ed903331f2f497d37e7314fc49e42ef76dcd1cca3726e1cc6bb8c81f372af32b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to domains identified as link farms on potentially compromised or disposable hosting. These URLs are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://oris-am.com/editor_up/ledawevutifaketemuwada.pdf In PDF document text
    • https://norservis.info/files/files/23521427806.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a1e4d88e8a---61263781857.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02a349fac---fumikumijumuduwokomijizog.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210912111031_l0s5u9.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/44282306664.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/mewozuwomomebagabebaga.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161378fc5ad3ff---81703228457.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/tesirotevew.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/18002790363.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136d9e4159a9---pokobimasi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/psel6r3h4bu8hqnt71bvr53hs4/89382282064.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/lusime.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/2f58edbaf55e8bb9f9dfa2934cd0ec07/91309518757.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/ludem.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/17167487916.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/14507430538.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/zemitiduso.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/libar.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/97014388199.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/zitoderutemuselevabagago.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/fugazu.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/pomapimunubitoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+can+i+watch+john+wick+2PDF 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_off0000b94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94E 10300 bytes
SHA-256: f58a4933bfddeaa6130581ca8e63d2f9ba6096e3afa08466ccb567643811e9b1
font_01_sfnt_off0000d073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 16304 bytes
SHA-256: b7149c067989c76538d32cdc872cf0701e43316302069fc7f678b2fd9f5724ae

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