Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2ab54c216d1848…

MALICIOUS

PDF

104.0 KB Created: 2021-08-07 18:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0715134695471eaaa2003af09af9e3a SHA-1: 7acff0cdbb41dec7d88bf859ff3ff2c9247234d9 SHA-256: 0c2ab54c216d1848d6aa4d0c3eb7aedc393d5750fbdb47cbd0a6d8d1bdd5a20b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of multiple distinct hosts and UTM parameters in the URLs further supports a campaign-like distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://synerhu.ru/uplcv?utm_term=beneficio+de+la+aplicaci%C3%B3n+del+proceso+enfermero PDF link annotation
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9395daa1a69693bf669b2e500b508eec/61911372931.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/niramopara.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/sagawenedum.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c0d848655de2c238b7ef2757945ebea2/weparatas.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/81693469854.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3bfe3e51e---jisabojitololewuniges.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607add45100cb---taxanuvefetal.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610039d32ccb3---vizorekura.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ljith11jics50ped09h5vc1pl3/54513248523.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/99353424439.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ip3rr31j3nahucavbnmk3dldpr/43061123486.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/vatuwezo.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/25023361461.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6d882bbbd125e8d7188b1999584cfa1f/tetel.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/jakekulojonazeke.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f125e434f9---15776280341.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210607_8F996A5E41108657.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210715_83582B6198B0DD3F.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/87135794620.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/bobagugerele.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/livivuboxolarolomasaxudim.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/9sp048s4puqojtbpl5cevb034v/36491313855.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/rifugumenetopofejefab.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210721/file/1626797235.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_off00012d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D40 10872 bytes
SHA-256: ac111dc54d6786ba671bfa3b58e02c1281c770cb4ba23bf3af12bd4a88671075
font_01_sfnt_off00014616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E28 19456 bytes
SHA-256: 35d25fed4144e970a5e73761868f75fb9d177d82247f5c8f3315d662e193d8ab

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