Malicious PDF — malware analysis report

Static analysis result for SHA-256 6963bbb1eaa96ca3…

MALICIOUS

PDF

86.5 KB Created: 2021-09-06 07:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b98e9f857df3bde88f1cf653ae8fff99 SHA-1: 6684eb106e394f3e5252a1cad67a9dca2f6e3dcb SHA-256: 6963bbb1eaa96ca3cf761df19d031c7633ab739848b36c9a1c5128f7409f39ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=general+info+reviewer+pdf PDF link annotation
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1iavnv5pmbu1macukfqbv2dbmu/98435722229.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/pejujewota.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf8675bcf3---kokabegesavolureguke.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/80682401485.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/wifubosulaninapof.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/71574324442.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098f87c647c2---tulivobadogelu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6be800c46---zezusulavemekanovix.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/5533930970.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/balunajazamudixaxarolizod.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079720640e0d---dofuxe.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/49dd7c66354557e60888c5e39a42e323/dagilowamojirojijubopati.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079ae4143c4b---49502241429.pdfIn PDF document text
    • http://kezmosas.hu/files/file/ligedipibojexesiwegolix.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/zejedoz.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f384c83c56---37259921370.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/09474f43351cb0f38793e56c0646bf79/suvakavuburovoz.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/35679399493.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/pumewogopapepokijugu.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/62324743377.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e62f0713ecdf56d117d40b73a7875322/figarodatesajokivovivaxes.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/xakej.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/muluzaxedojitig.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_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 18880 bytes
SHA-256: dfdf6a949640c7fd1011262604aa6c98a4e0ba563d6790d1dee08f88f379fed2
font_01_sfnt_off00011ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EB 10416 bytes
SHA-256: c5a9182ac950171044273bf7ae35a5081397d4f5f94a6ffe8e29429370723757

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