Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d36705ae7dd26be…

MALICIOUS

PDF

154.8 KB Created: 2021-08-11 05:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7b73c114e4ae96d64638354fdf45f4d9 SHA-1: ad93a1a087430341a80390dcd2ad422a4d218e30 SHA-256: 6d36705ae7dd26beb63e0e48683597cb44b8250faede2870b3bcc79aeab3418b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised websites and disposable hosting, suggesting an attempt to distribute malware or phish for information. The presence of 'link farm' heuristics and URLs pointing to WordPress uploads and form plugins indicates a pattern of using compromised infrastructure for distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9cf7f86e---pugivuz.pdf In PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/dubenevudogunov.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/pofenirulutoxirusofuxuf.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c41cbcd1b---35224949026.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b414c6884a---tojopegafes.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/me2rrlcnn36h5fogaus075d422/42613323213.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5c0b774ca943b7729c33e97043ca3cdb/89171752920.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b5ea3cff4ccef9052a221ea9c7a5e591/86254796096.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/36u6len5one71qhaclo6pf0kl1/91425142128.pdfIn PDF document text
    • http://rts-3.ru/upload/files/zovuteminebezur.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0f4ef1e7a6a0145bc0eee59e5a9b76d2/99381884869.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c622ce6eba5---60732231827.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/29014013432.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/dafigejoravorel.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/20814616292.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/35755986342.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/43ddc22ec2a7fd2c19ede0e14867bccc/ritubuzigelejavejipumem.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/lajujaliti.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/guzaden.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210629_27FB060F21D9714E.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mhgguhe8if7r06f5kdp9o97so8/bojawidozenevamem.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/53862377913.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/76215528315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+apk+sakura+school+simulator+version+1.030PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00023ac2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x23AC2 20204 bytes
SHA-256: 8d0165fd6074c154e483af2ccae9c3e02c2d78bd8ae3cbe2d30470a086352ae7
font_00_sfnt_off0001d1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1B5 17300 bytes
SHA-256: d279a777797aff5db10519bdd9531f1407429365f47045969adc6dc26da51a23
font_01_sfnt_off0001ff48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002175f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2175F 11536 bytes
SHA-256: afca4d60db2a117459e6868f904a2cbf6d949411394a64e525bc67b7dd1dd707
font_03_sfnt_off000232a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x232A5 1700 bytes
SHA-256: b6744b52a823c6e0caec6b019a394156cca920341963d9a1e29782b3509c409c

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