Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ef2500809c252f…

MALICIOUS

PDF

73.1 KB Created: 2021-07-13 23:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fb2331cad86ce237ac7dafd936560935 SHA-1: 3f3b5ffb1eff16b5868832089f92de20eb41c97b SHA-256: 48ef2500809c252f12af0c98c443b5e8e852b462aeff8c895853df182855f437
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://fotovipvercelli.it/file/jewizijivo.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160808d2ac5a35---nininawutufutusijaja.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/xizesalivemabaguxo.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd9ab64ffb---daxamanebilukitajiwixi.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/wewuvitolu.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/29526146869.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bad9ee121---xoromavokaki.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/65e4fbe3f35f7be07d15da44af0eaabd/43526671132.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/rijagajajerawuwiru.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/10426483425.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/37097004790.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608440230c9e2---56666736645.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/96655288021.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b5a1533dc27241f8088731519c59c40f/29755764991.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/zafijulawalunazuze.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed355903d---91163471784.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2110b028ac---33727979420.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c88083229e9---vudikimikowipewogamekukub.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/nuposiwusavaf.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/wupotedamanogogavofulew.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7e43da377d3254b2c84393065d1ddcd2/juxiselawuterosujiloxep.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/sowitabizak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=water+supply+and+drainage+systemPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB29 16796 bytes
SHA-256: 88780e3dc3063bcf041d32a819a6004f702eb8c0fd5cfdb5e4cbcb36d3980048
font_01_sfnt_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 10820 bytes
SHA-256: 4dd7764c86c46d4ca6ecc8dfb03dd14670762d3089f2188bde659e0259a358d0

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