Malicious PDF — malware analysis report

Static analysis result for SHA-256 8002591ebf9bb243…

MALICIOUS

PDF

79.1 KB Created: 2021-08-12 12:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e37132706c35b86aa844f0022961af4 SHA-1: 3dd53e3e72ea68cece9968c2a4e2dce5c4017034 SHA-256: 8002591ebf9bb243e25568d29bebe9fa60efe68165bd09a8b214077ab43150a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic findings of 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/72f2c141cad5fdad494c73f86a360c41/18170818680.pdf In PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b509ced8f---wamupobevupatolokenoburul.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/363c5f7d64f8afd1365cf34b5e8df105/pudajivefomamiw.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c1d08d2d9---14500097662.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/5fa32f15f3fbc9c9e12bac828122f6bb/85741056310.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ba51c7f9d6143b2ef486e4dca55b84b0/rivakepasatuma.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb1ef72dea---96363290803.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/70c8c91653579fe13f70a87a577bc32b/pagukotepeba.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/93966775812.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7ba12acc0b88dd57e6778c919c825121/nelisajijofej.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607816764c5c2---30580408587.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/zifenikavobitid.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/32395737344.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610e2edb2689c---42119226029.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/zofisejuxonowoxoxoselase.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210616_8E44C082AF72E33B.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/61870424507.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/nosetogipexudez.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/xuwerilixanuv.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1d514654c1983562631390028719d605/74315877409.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b7f5970d563ed1cb19bfa0cf726eaf6b/nupan.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/57344324606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=area+of+composite+shapes+worksheet+freePDF 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_off0000d18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18F 16440 bytes
SHA-256: 6812f3cc60d3c0b5995e213454e5f820ddec29892ef161bbc0af55a0d36354c1
font_01_sfnt_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 10752 bytes
SHA-256: 4ecc829f26009f5c2bfaa2fbe11acf4f44cdffafc7bd9a4f0ba96ea1c5861676

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