Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf7ee7eb4fe7f21…

MALICIOUS

PDF

86.8 KB Created: 2021-09-04 03:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 853e413535cdaf1164ab4f84b2b77917 SHA-1: 38b32d1e608d063c92f16820225c3e6fce703df5 SHA-256: ecf7ee7eb4fe7f21f5be68bc206573718ead0d12efda17603ec943b2d40a68b8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and embedded URLs align with techniques used to host malicious content on seemingly legitimate but compromised web servers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://medvor.ru/uplcv?utm_term=engg+drawing+pdf PDF link annotation
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160753dad5b02d---82394707390.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ff17631bd---99725641884.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1lpef2u65a7qu1dc1u79u7e23f/7047307590.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lnc2hnqfs1n4nnj7nggr9j5qsm/24076237542.pdfIn PDF document text
    • https://ms02bet.net/contents/files/vufunuwexakerebi.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/36833386075.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/48098678932.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/60574145375.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4250fcdfc0---vugevifajivafizetinove.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/38432365490.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2s2e7ljbtm73lle30ppue7o9kt/linez.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/piparorev.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/32389588358.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160aadbd3dc1fd---81919358756.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215192233282553.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061522450573499.pdfIn PDF document text
    • https://vzglavniki.net/data/file/10754874280.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/93422017381.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608518404c113---tewenadaxifugurom.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/guxilovelatalusero.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df713604015---zelamafiduzasazedonapuwe.pdfIn PDF document text
    • http://holzbau-napetschnig.at/nilefamemenogatunuk.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ol0nvi1pvovdph8f8ib04tck20/zuxelo.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/31d114c45eca0db9b72d35d443d7dc68/wanekiruzegozaguvabat.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/21505547877.pdfIn PDF document text
    • https://inncredel.com/uploads/mefujosadujane.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/hir4s0l3vjaf6n91c96abd1s17/jewipotakevitipajisosux.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_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 17928 bytes
SHA-256: 8e802b0e18dfd4849385a2d4084bd8596ca502705d93e9f649e9a37714db2ed5
font_01_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CB 10180 bytes
SHA-256: 74c9cc9d7578ef155689c33053b6e80ce44cff9197fc33bef8307f83e8fabe6e

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