Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd5f2634ae8a21d…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 16:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9da3baf8f1f42cc3718fa42d73ff58f SHA-1: 6a5640224e57511fcd5ac44958e859ecc9b109eb SHA-256: 9dd5f2634ae8a21d55ddf443f5e79016ea3b184e638036974851acb2362fa8be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=partitura+amparito+roca+pdf PDF link annotation
    • http://fuga-hotel.com/CKEdit/upload/files/50900632213.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/wosus.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/xikeg.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b922a2105---97399560336.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/kenezuruduvibovu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078100507329---39288599717.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/pagofadapazo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/99cd83467c2942ebeb8ff2220e2006a8/32024789496.pdfIn PDF document text
    • http://premium-h.info/files/files/gikowizap.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/libeditamufodogikasowuni.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/sosoma.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/18284842208.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb5fe0a7d3---7037375939.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/kiwuvina.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ce41c335---fikuxizenevomose.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d36f9aaeb1---98130270285.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/32339639597.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/vuxujenibuk.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a6cedd6a---poreponubogev.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/furipasajekukekojukuv.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/89002788516.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e686ad8e1cb---88552640782.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085699486014---31189084222.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_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 19076 bytes
SHA-256: 76ccc6cfb5ba22942b8bb7e1378fa8d9609fd7df3f4b58059e06ab9263107594
font_02_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 10432 bytes
SHA-256: e49f50474c87908bc496e39189f77f8e369ecb1acfa5214c5b24b898cd28db55

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