Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfbdfd9416eedfd…

MALICIOUS

PDF

94.2 KB Created: 2021-09-17 22:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dec4e6a71f4ac2f63ae0f9adcf592e52 SHA-1: d2acc012031e2761d44ab2fb79748fbe80cdf911 SHA-256: 1bfbdfd9416eedfd2377f8be668eb6e59c5ac14fbe807b699d1fa53062c07c00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://queure.ru/uplcv?utm_term=123+movies+with+subtitles PDF link annotation
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139f87f239b6---lukokatetubaronakir.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/widafezipogesusejij.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/10702160231.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/xefije.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/95bdf039cc39bd72e958f652195a3857/78265313946.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/lezepe.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/rirebepejuwidinu.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/36007478644.pdfIn PDF document text
    • http://fourfoods.com/images/files/92664611965.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/71113771250.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362bc530e66---piwenoboberezezokovepe.pdfIn PDF document text
    • https://znalac.com/userfiles/file/35266377669.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/sepajakirinoza.pdfIn PDF document text
    • https://sapporopools.com/contents/files/dusisuzaxomonatunagire.pdfIn PDF document text
    • http://uteambio.com/upload/files/62292440818.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/43502029378.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/sisegitida.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142ba0765c0a---gidaxobowogobarapot.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/wunijojumamumugatamed.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/texevajijogujojarakenu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142ad6ead6ee---14537723280.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/tolubujexivoj.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/06/file/20210906_232150_192.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/xetatatasuvunax.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_off00010d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 17424 bytes
SHA-256: 5eddb05addf572239e8e551e384590b42714e4a1293715196304d2950e505491
font_01_sfnt_off00013a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A74 10644 bytes
SHA-256: 927e50517ed8ee593e2b85c60a80a60f7093139478f46c7bbf0cf1a6fde70f4f
font_02_sfnt_off000152fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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