Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8daac3fb25172a…

MALICIOUS

PDF

97.0 KB Created: 2021-07-08 08:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a6978d724c4c31e69dc2a64a909dc3b2 SHA-1: 95e4347ac4aa25113e36d97b1ad59ed6a1e5f155 SHA-256: ef8daac3fb25172aef8ad6166919311bfaf659ff27ce7c45b20a8f4932ebad7b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for distributing malware or phishing pages. Heuristics indicate it's a link farm on disposable hosting and potentially a compromised CMS upload. ClamAV detection and ML classification strongly suggest malicious intent, likely as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://interwork.sk/userfiles/file/xegobulikedijeto.pdf In PDF document text
    • http://zrdb-drogbud.pl/Upload/file/jovufisapatetuwifivaze.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b7c90042bd4b6056ad834aae06f64d40/ropoba.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/a37a99e6a9747e0ca36abe35057d46a5/lubujola.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/055sfc1n2jmm9epe9kpi0ja3aa/63021836670.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608797609bd6a---77674828789.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/4723732521.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe19aaa849---28275187115.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/pevakusi.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/pudunug.pdfIn PDF document text
    • http://coffee33.ru/archive/file/98675454232.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/86523992795.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/puwofufizepesin.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceda851820---jasutumakisi.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/tomolazemowivem.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/patovowugexebivetanodori.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/78ee0f8b4ede5dc8659e02439be42bc2/murevutaredivezabi.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/gigotelegilidikafususalis.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/kigedutezomukogasefipakik.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64056318621.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085776682ca6---85654069176.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/34482512714.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/kiwilofevobesekesomepavef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=tribbles+and+tribulationsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001189c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189C 10444 bytes
SHA-256: 251aa9dadd5c998c946155f757afb3abbe3b66d10daf07baa10b879389e8a1d1
font_01_sfnt_off0001305f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 17624 bytes
SHA-256: 5c8eb00488f1bc7f952f27470a9ba26d2978db38885717ce724cc1b6a546f3d6
font_02_sfnt_off00015ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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