Malicious PDF — malware analysis report

Static analysis result for SHA-256 137be025a370b0d9…

MALICIOUS

PDF

91.3 KB Created: 2021-09-17 15:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b276c794cad4d52a64fd9732a68e93ad SHA-1: 108d5d0ce64406c1e29f500da28baa88c3f12b82 SHA-256: 137be025a370b0d929124d7400324004bbf34ba0c7a022f5e375e164ac755310
172 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and multiple external URIs. The presence of a 'download button' heuristic and links to compromised CMS upload storage suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=call+of+duty+mobile+highly+compressed+100mb PDF link annotation
    • https://www.truck-transport.com/ckfinder/userfiles/files/65981329647.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/dirosipiwaxu.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/51946904790.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/nafelabaredotebad.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/86536807190.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/37739401810.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/kidurapepeteziw.pdfIn PDF document text
    • https://fptica.ru/images/file/weseg.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/gekafirolekerinakudo.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/patukirofomofozegelumiro.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9321877ac3ee1568386c08b0154f913f/28223625649.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/kekabulana.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/32559543099.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b1885e9c8459eb9d1dc62ec59a5bc458/vimikajifisegutupapak.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613507aac5653---52153480270.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/62286117526.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/1085931532.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/55241499433.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/60715283910.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/34262940572.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/bavodewaje.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/72734595994.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/31218807453.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/kozazozuwedu.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/fodid.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 11520 bytes
SHA-256: 10cf9d3a0b6f8063c97e5796be25d687a87abf46074ebdf61e9c69b98a97bb1d
font_01_sfnt_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 20368 bytes
SHA-256: f437af8c5ee225a40b3644cd7cd0f0b1cf66a62e796189c8b78ee75047021b63
font_02_sfnt_off00012c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1B 17612 bytes
SHA-256: ba6df263b989fca2e9f109fbd4f9153bec95528a283de9a5d474c022d448d228
font_03_sfnt_off000146d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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