Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4d55d074864f7b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 01:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff7680ce33a8ab10064ed835b96445f4 SHA-1: 357b28b67352c066ce8623acb8a1c32fbe9b1820 SHA-256: 3b4d55d074864f7baa366b30e85022083b95d9b2ec7c1e93e46fa233bf370bee
164 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of link farms pointing to compromised WordPress sites and external URIs suggests a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this file is part of a phishing campaign, likely using a fake invoice lure to entice users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crysiq.ru/uplcv?utm_term=personal+account+examples+list+pdf PDF link annotation
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1f20c453575fe9167890debf7ca4bcfc/gorilarisakurutulalas.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/52881481742.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/zisisimipamijonadodagubam.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/75840225688.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68d5cea5c2---29812729719.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/duvesuzovirit.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2vuerleijakakhu2hfkbkuv71h/83650222022.pdfIn PDF document text
    • http://kunbot.com/upload/files/74813883069.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33f87d400e---gidinepofexogolu.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/18968153865.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/2146251784.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/jg1kt65e37m2ba8kkkfddk4p60/58837225453.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/79814827565.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b946cb5609---mokositalafusalinifekivo.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/27457174497.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/fufabekobub.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210708041605109.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/oojhtoma46esi7f5idbo7vff0f/25604396331.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1766bdf429c2b85741f704ebc0aaa32e/xizigukumixigorowati.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/pinizexapebobe.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/tisebumumup.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/buxupofifivikorafejonub.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/kepavuradazusivowov.pdfIn PDF document text
    • 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_off0000ccd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD5 17856 bytes
SHA-256: d8abc778724a67405d701186ca63091897f1aae964ee602fab6c989e44b9b48e
font_01_sfnt_off0000fb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 10984 bytes
SHA-256: e0aac22981a4cb75652cb275cd4f1108910071b2b2dd6c820059f7756c4b076b
font_02_sfnt_off0001148d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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