Malicious PDF — malware analysis report

Static analysis result for SHA-256 834b7b6cd5446f31…

MALICIOUS

PDF

89.1 KB Created: 2021-09-08 00:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7dc489d1ceb3cef835b2b8ac6fb444a9 SHA-1: ef0270f009fd5bead9d767f2584034aac990de4e SHA-256: 834b7b6cd5446f31d1a3b8cdcd91eeb5345c463b5122c1e6528bd1eb8a7cd0a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://webbyshoe.com/fckeditor/userfiles/file/3782396370.pdf In PDF document text
    • https://rybczewice.pl/userfiles/file/renawabetilepetijog.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/77214698611.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc0c7546c---mosubovuwemisat.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/11175532822.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/funebage.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/4297227689.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/73960408757.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160e05209b434f---rejegigajinezuzozalim.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/zinodetulipof.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109062248460511.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/sabino.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/806e5b5182e5d3d29742f90d03e97d53/57879000028.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eb63eceed---vexisorumoro.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/tupukeb.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/gurovusow.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/vusakakamezomaxazes.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/6cdbc5224041d4115c1233002ef86d07/mifiruwale.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c281479de3---44073998191.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kitopopenoropedatononut.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1f1959d58---50760199415.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/mukivufozupajokuseduneka.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/ruzivit.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/60113766251.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3910a68e11---jatimom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=aquacomputer+aquaero+6+manualPDF 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_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 17996 bytes
SHA-256: c9eb9aceb7ea8f386e740851d2107a3c11a5f92151ec935f67d7addc283aa9c0
font_01_sfnt_off0001259c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259C 10672 bytes
SHA-256: e31b13c83e845bea0249f71fb3afca42bdb6df29a00e15d1b1c5990b198eebef
font_02_sfnt_off00013e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.