Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d50d6d0399c813…

MALICIOUS

PDF

104.2 KB Created: 2021-07-04 04:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 143662e1e3d8fd684552591bbc3c8f48 SHA-1: 6705a3f6048ccbf5708b5b5999a60c250ebf853b SHA-256: f3d50d6d0399c813812d021e162f3c72cfe3dbd87cdf4a6340f0601adb37dd81
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites, likely to host or redirect to malicious payloads. The presence of a 'download' button lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=one+tick+pulse+extender PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160706e59ecb96---sokufelikerisukili.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/7864811622.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/4e07a38b375565243239ddb3e3dfb14b/wufel.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8c85697113120c411fadbc348334898d/nemamap.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/57570161308.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/gufadufewotajurepukawixu.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/busoziwopevog.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/6gtnp3rgk8pg3q57fsaic8q4gd/losepu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90aa5a18be---depalesixopibamabo.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/xavosunedamuboretasonu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/pijadepapugiziravijamep.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/446bf1cc6eb1f7a025d394c24844abcd/sonolizofalese.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f247874f3e---60531729407.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/20f5b60a0c7d545039d6daf6e5c8897b/29169143798.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785ab52ee58---81995207621.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df96884e44---feranobejizenajafutopur.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/62257670002.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/xiguwonikel.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/voliwibodilujupegajejas.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0b97c40c730496719790792fd7f6c66e/gupevuwufusodarirojulejaz.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/fizikokajapisore.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/77392810888.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10cecd33c9---mituw.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/l4tt0db6ja1vi6kcsst1sandtt/doxisilurofixixuloninigo.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/rowidubarurip.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a00b20223a5---95738838659.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/kigivopimudupofimapawo.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_off00012cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF3 10544 bytes
SHA-256: 6d0c0ee3334f6c25ed11446387e11d440256f254503cda569b7e8e5b3496f079
font_01_sfnt_off00014529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14529 20588 bytes
SHA-256: 3117d1b3204c965dee0b958c8a3e0932917bb975126388ff96879eecdc1e7825
font_02_sfnt_off000179bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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