Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed3c9c80a70de3d…

MALICIOUS

PDF

86.3 KB Created: 2021-09-03 22:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d51a07e36c244fb9cb3d3d372fded19 SHA-1: a8b2e120c2b2051d0f8ce6f8b2f3c3cc13ff3402 SHA-256: 9ed3c9c80a70de3dbb48a9a589d02309f55c62cde203c70f1a176b45529ebb2e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/14717cf6a770e827fa971d88c1bfef7e/1047865056.pdf In PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c20148a2a8385805b5c45e866c9ea710/2296339062.pdfIn PDF document text
    • https://edgecs.com/documents/11219378585.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/sqffpkvpbvvtevkq8k4l2gsq4i/29861761713.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091b64bd799b---somekiparaxidojolokipam.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080f21c4b0c2---vudedinokome.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/9944172098.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/40343079754.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/bejarin.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/witodupevawig.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/jagonimidaxo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/oon287c1m2ub6ndkehrqg24nbe/vapufobon.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/zaxaben.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083dcae92d91---1325913287.pdfIn PDF document text
    • http://polletnv.be/uploads/files/91024941046.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/98140585985.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781a58ed0c5---difepudemazajobifepisa.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/wopasesa.pdfIn PDF document text
    • http://gabortech.com/admin/file/wiferozejonegusidikasowox.pdfIn PDF document text
    • http://sport-way.ru/img/file/31824176232.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a16dd507633---72637080733.pdfIn PDF document text
    • https://puntoagricoltura.it/file/7763277788.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/48876309476.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/ledolakurimixozusetikaw.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/255927b0aafb9363f63a26823e5efd61/44327519295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=foundations+in+personal+finance+chapter+8+answer+key+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_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 11296 bytes
SHA-256: 71e24238dddba15cf69ee7a708aba7a304baba1fe4118a62735f67eac28865de
font_01_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 19592 bytes
SHA-256: ae92c71dfa0ad827f311e86f67037bfa2ca6cabae6709ac98825c6c63033213e
font_02_sfnt_off000132a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1