Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbeadb5813315ad…

MALICIOUS

PDF

70.8 KB Created: 2021-09-02 16:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 3e27b849968c2927499a318b25f109ee SHA-1: 4eb1fa871fa5a599f84adb162de1b6e58e5710b4 SHA-256: 2cbeadb5813315ad48abd232b5791de30a6a287adba93b0b93a850113daa3b0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute further malicious content. The URL 'https://irlanc.ru/uplcv?utm_term=pdf+reader+application+for+windows+10' specifically attempts to lure users by masquerading as a PDF reader download, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=pdf+reader+application+for+windows+10 PDF link annotation
    • http://altadirezione-consulting.it/userfiles/files/livirulafu.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/57463043464.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/waxeboni.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/94402284341.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609a067eeb5af---mapenaku.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9402479c6e---14415804959.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/44108607233.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/65796546302.pdfIn PDF document text
    • http://www.centralperdana.com/file/bufejinoki.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/89da0bbb0c06aabb697de013db149516/petozididubin.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/22862992425.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e982ed26133---xezuninubigaxupo.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/32152369758.pdfIn PDF document text
    • http://riversedgefm.com/files/file/92201326944.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f8d906a8f---69629473915.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a97dc69c8e4---kugutabusixe.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/femafisaralasoxabigirun.pdfIn PDF document text
    • http://russia-ex.com/85765107770.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/19d4db3e457f2ca008a0fb96c7704d05/7868272779.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210529_212B083AD5A419BE.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9c530292---nurogi.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/98344755227.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/zajawewoditufagamuwepaji.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a38e2cb8fa5---3757790131.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/tizosurufesodavevijowu.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_off0000b539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB539 15448 bytes
SHA-256: a6270a98d93faaac67cd0b1e03a4862769e2d330892f315904f28c07ddbcf1ce
font_01_sfnt_off0000dc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 10872 bytes
SHA-256: d686f205b4ac77ec8e6275518b70c7990668d2babaa53091838803b2c66eb88a

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