Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02ca542b4938c2e…

MALICIOUS

PDF

113.9 KB Created: 2021-09-07 16:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa27d4ee0cce5ab3ff67639791120642 SHA-1: c8302de9bfebf46ac55e51ca4d6f1dc3c96c5768 SHA-256: f02ca542b4938c2ea21a4fa06ff17be8d792b9cfb870f94d6226c9b6e3537ba9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, with many URLs pointing to other PDF files hosted on various domains, including a compromised WordPress site. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a larger campaign to lure users or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://dobski.pl/userfiles/file/lusoguvabekenelowavomo.pdf In PDF document text
    • https://total-sport.pl/img/upload/files/dapedofojinajanemagavejap.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/dejitukakisokozipaj.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c1b8bb5c5---75564746086.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/nolofarega.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/zomiferoxinutit.pdfIn PDF document text
    • https://activepymes.com/pub/file/54915477569.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/lidokeso.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/1985556819.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ea9160cad2e3957d4af36159b7c1c4f3/xunurazafilonepuranesi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f759e4ed060---78461748163.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/98587848476.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9a8bbee4e---sexokizavamidesu.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/xivebazatekexujekuguru.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/96568231955.pdfIn PDF document text
    • https://badrivishal.com/media/52630901746.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160947a6c96eb9---25803481555.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a83c6400---82456754865.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/pk3bp0682p7bir9dh4saqambg5/50546440427.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3fe7be695---40868877331.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210525062037_ei8zv9.pdfIn PDF document text
    • https://area5srl.it/file/bupuwunutatuvarizoneg.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/vuxezupugitigimebugime.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/xanirafakokutevilir.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/41790253462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=siemens+ladder+logic+programming+pdfPDF 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_off00015671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E88 10940 bytes
SHA-256: 2fe6efcb32833a68dc34ff58b4cc2f9c3dce88a82988f154c68bd6a2b16a17a6
font_02_sfnt_off00018787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18787 19200 bytes
SHA-256: 1d74523a85c61f1640039548ea394e1c0b9ce0740e9f781ebf2d8f1fd93487e1

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