Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f512798bfb59a9…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 09:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e9851bd6e22b94866b424f40e53ff8fe SHA-1: 14cb640ed907d79538d3eadb3ced539b8fead20f SHA-256: 19f512798bfb59a9ae45a53b1ab22380e2d0b592ffc13b986cc1c2e171256a21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of multiple compromised CMS upload links further indicates a malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=gift+card+envelope+template+pdf PDF link annotation
    • http://pekingtogo.com/uploads/files/kuxagodupiwewoliroviba.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/51ecc8592dd1639d5de02b1340d52fb8/segunapuxi.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/gbf7thl3js69me3gpnkcla3ujn/15085615149.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/90432553211.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806496696f1---pabaxaf.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/zawekisexenusutaxarisudis.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210807151331710.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/32e278cd53c3509efa6776e475700ad4/98771887391.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1628375585_1f83137e59.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d2f32a619713eddb7ea1581c71aad43c/31992695166.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/68122294260.pdfIn PDF document text
    • http://runhouchem.com/upload/files/18614900953.pdfIn PDF document text
    • http://rayanchem.com/d/files/76172047400.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/bamubaselupidutatesote.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/5171886921.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/5640131173bc92132e509be6612db768/tevefufizidimeb.pdfIn PDF document text
    • http://ministerium.pt/files/motumogoborobuka.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/60160b56bd40d4498292acff98eaa7fc/kiteximudeleke.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/73a571807ce9fb86fc3965a9f7aec340/61272225194.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa616955ee761d782718eef2a8d22477/wabesosapelobomo.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/6934608715.pdfIn PDF document text
    • http://jaht.com/userfiles/file/pinosezemomumoxevizavis.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/okg5gkj9th5dcor6agtr6tfmo5/gilugama.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/55995880457.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/wenun.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/62659392718.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_off0000d57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57A 18120 bytes
SHA-256: 9eda423499c838c1001bea5ed563ad65334721257e6a2836be7027d981b049ee
font_01_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5F 10716 bytes
SHA-256: e1c765c40b41f7cdec96c685006cd9d6db62a4c93737b3e70f3bf626b0245549

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