Malicious PDF — malware analysis report

Static analysis result for SHA-256 9172daaad2367ecf…

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 21:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a49ac867da418360324f5bc379504ebc SHA-1: 4d4b0492d594b525f1aaeffc5e7daac395bb11d5 SHA-256: 9172daaad2367ecff541f7823f2d383d91a94fe8785102edf8d7e6292cc6ffa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farms pointing to potentially compromised WordPress upload directories, suggesting it's designed to host or distribute further malicious content. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware delivery schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c1ec928b6---pefazeresigunaj.pdf In PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/94b9f2d8e5b6747a3ffa75ff636f8ab5/zapar.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc898b824d---67099289953.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609256ec7e4fe---fanafenixukasovego.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8fa6bc637---43969356516.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/ramuvuj.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/takesopavopamozuwu.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/futuxaraximidupelanaxe.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/9hgth7ovi0ckvhq74kgk0rm6tq/wisekimelatakitesojotuz.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/xofisanuguretagasasokidu.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/48186750287.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/kufose.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee32f383f---7391959648.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf7c10366---gidexofaxatedasud.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f51680172e---45417235611.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202176242592804.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a7feaf142---gijemopetiwifif.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/zobejufopolixilajobusor.pdfIn PDF document text
    • http://fitviewer.de/files/file/zosoduro.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/46663591661.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a77f0865---netiperebalefev.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d1172f2b---sigokugipugoretemonidaje.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/63648501505.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16097503ecb752---sabuzijekena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=leonardo+da+vinci+pdf+walter+isaacsonPDF link annotation
    • 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_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 19708 bytes
SHA-256: 7981fa081a3c21d8f28a33891f5c693635e7a1bf46957193738eda8344a8d78d
font_01_sfnt_off00012230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A47 10724 bytes
SHA-256: 79e75f3e1ea31490e971834d9ceab68ac2601430894bb9186a65900e12e46407

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