Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a0097f8bb83865…

MALICIOUS

PDF

78.0 KB Created: 2021-08-17 15:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53aee9f53a788d8473467810f8baed91 SHA-1: f4e6a418005f44ad4a52c8c724a5a10150526385 SHA-256: 51a0097f8bb8386556528d33742742b10b2c7bc76676cb28f655a77a9d88429c
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 numerous URLs, many of which are hosted on compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests the PDF itself is the primary malicious component, serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://langeline.com/ckeditor/upload/files/xigajupukosivi.pdf In PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/pisina.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/tigeraduwaronolakilanewaz.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c98959fa4ed23df89c8d7de94af1b527/83451048587.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/tulobujowugozel.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/3377468453.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/tukofire.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/kurenulamo.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/8272809235.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/xilabatutevofiwe.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/770a4d4e904c24f7968b211dedb51a9f/82153797311.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/keraludapar.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2dc246a48---wulukefalit.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/29602499967.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/71ef8b07b95f1d5c707bab366ee5a0fe/juwaroxovebiwusezun.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/puvebepovi.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/j4qqtq3lv8m5i3o1qqclt215pr/sibetupuvonetubomis.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/c9ea69917e41b775d8a9c6d728adf5a3/nitadaf.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/14124402347.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/10945027245.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/76219249561.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/536f0312e35c66be700efe69045095ca/97440146311.pdfIn PDF document text
    • http://e-hane.com/files/44995140960.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608faa36452b8---94687515854.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16104a5478a6af---debakosorodarik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=paper+bat+wings+templatePDF 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_off0000ce58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE58 10704 bytes
SHA-256: eb4ede519b7620f3f21315e077f8a39a607b2d57330049057e9a5d08c19b9cc7
font_01_sfnt_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 16164 bytes
SHA-256: adea45ed424bd4f609fef8e43085e5ed62690c0a67847c65994be8a4412deac3
font_02_sfnt_off00011085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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