Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe14b83e2c96953e…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 12:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab6b7dbebeec31f03c93438c8a5e6140 SHA-1: 3036322e98b466f4483db0faf8381e1e7272f4a1 SHA-256: fe14b83e2c96953ede3b255af51770a358e47a5e67c65c6cf6b1469b777c3434
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm, suggesting an attempt to distribute further malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://noxsun.com/jingkelun/userfiles/files/20210804064703.pdf In PDF document text
    • http://thebankcardservices.com/uploads/files/nojuxawaguxonorumizod.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/nakunusera.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/vejijododogaxudedupixevuv.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/jilesanadibaseb.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/giloraxomijijutapew.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/82934317340.pdfIn PDF document text
    • http://jonme.net/ckupload/files/vojofevofesa.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/neragalefavubenizux.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/3745393141.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/10176853081.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e90a94c6a5---telivadijolivojobimix.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/73937182292.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/konojiboxuwanazidabo.pdfIn PDF document text
    • https://udruga-invalida.hr/files/rorozotixusoradakew.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/81129057842.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/88631702442.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/6201118538.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/4d533b3fbe72a36ae68b00ffbb15da75/65214601995.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/62670450761.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608954972070d---foxudisezanufozunav.pdfIn PDF document text
    • http://wawa757.com/uploads/files/fusawenoravifizituzenorut.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d7921e9d023---22781483065.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/riwuwik.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090408483785632.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/dc64eab06008cea4a119714a0a21fba8/paratejugaranadese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=1994+toyota+corolla+manual+window+regulatorPDF 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_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 11048 bytes
SHA-256: b58c9409fc0da42d7e6917cc39c297d8d2f70c4d2c58cdf9664b391df08a6b5d
font_01_sfnt_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 17388 bytes
SHA-256: 6ea5a7c09f0b72bca1448a3e8ce7ee0d4dec2ab50a9bc05722493b5d9651aab1

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