Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac9e0fa1a06fffd…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 08:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c157ce681ea328c81fbec9593e12aa6 SHA-1: 7a6e771fecc5515856de5630bf4495ff8015c608 SHA-256: 2ac9e0fa1a06fffd2b2af6ed72e2c0a03cc6f8a7610293e83988fe7357eb98be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://phuquytravel.com/nguyenvanlinh/files/zatenisajizotonegidipu.pdf In PDF document text
    • http://doubler-son-capital.com/photos/files/murosunasagamijalis.pdfIn PDF document text
    • https://iword.de/userfiles/file/19752709503.pdfIn PDF document text
    • https://mytopics.it/uploads/file/96726541317.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/jalaxanefonigox.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/13297597010.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/49403802829.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/97876017688.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a894c41db---morudolibegenekituruza.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/fiqvf9fpa5bl41903oh2umseae/rizetu.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/16275529032.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5907a4cfe5---sirokexubimepedimiz.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1f6981a70---53279531696.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/12633594764.pdfIn PDF document text
    • http://www.520amis.com/upload/files/pejidekari.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/40d088e2262a2b171813dd0dab205abe/mokifujidejokabuwo.pdfIn PDF document text
    • http://wenxuezj.com/images/File/bidodobofekilopuruzaleru.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/gowexafaxojaxerejinurozap.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/43663181475.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a0fed88ff---tiruvoj.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/xutebilazutigujubusa.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210520030421.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6357e89505---lududakexajikevobemaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=kinds+of+sentences+according+to+function+worksheets+with+answersPDF 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_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 10976 bytes
SHA-256: 393baf5713268e99a73309409b705046b2f85ac76bdd3e3c3d0dde57d3d9fd7b
font_02_sfnt_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 16940 bytes
SHA-256: a597a3018c84abdb10623de27e8bbc76f7aeb6420179935ca23718336780315e

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