Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa44af7cb5e5c19…

MALICIOUS

PDF

89.4 KB Created: 2021-07-03 00:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58437472002032919fcb38e054e9c248 SHA-1: 9269843838b0b77b880a42d3ff00f7d9c283a881 SHA-256: 9aa44af7cb5e5c1937cd186509382a0a834effe8f5af6f88da3cd4e9f9ba861b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs suggests the PDF is used to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://coretry.ru/uplcv?utm_term=dragon+city+breed+time
    • http://vladjurnalist.ru/archive/file/sodubugudo.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed791541b5---lapalanoguxakivejoxuvito.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/539d9e46c975bdec964347881ccd8714/kavez.pdf
    • http://munsusa.org/userfiles/file/20210605105423.pdf
    • http://fsoa.cn/userfiles/file/nozifaxidaj.pdf
    • http://consulcongress.it/uploads/assets/file/fexutunaziwozuneroze.pdf
    • http://tpdw.pl/userfiles/file/sozawugotozupapulafo.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c31ac77c554---zebenojug.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bedf65bedc---janoxilevifa.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5018c020b---96346225855.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98ed061e67---pijorenalevat.pdf
    • http://ebslang.net/_UploadFile/Images/file/mafudifaz.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076abe7f24a8---53754565848.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/0884469ac07498975b314c50f693f305/vojopirosuwujemap.pdf
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/21018723721.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160805a3908617---45462406998.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3284f17e---zatef.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160749a090d0c5---fexiwone.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/44a78fb4469a77a2a41143b051bf8321/53736788001.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/44fab97465c070f058d2d8dd55226f73/kitop.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aba38bb2b46---mugemipekanogonubifupejif.pdf
    • http://baigeleather.com/userfiles/file/bofutumijetavoruj.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4a193c626---82897078936.pdf
    • http://automotiveenergy.cz/userfiles/file/6977614804.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7e4d9093082378db20d1716a59eb87d7/suragamamevuvisepanexofas.pdf
    • https://mimpiindah1.com/contents//files/66127802217.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa4a.bin
18a107251aced598ed3cc37f0618f9bcc017c9af52f2e77ffd5667fed759cfc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 17384 bytes
font_01_sfnt_off000127c3.bin
869996d8dfb9175bc69870336da73a707c98805bdf055f96036ab7e899e55955		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 10756 bytes
font_02_sfnt_off0001404b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1404B 16792 bytes

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