Malicious PDF — malware analysis report

Static analysis result for SHA-256 e224a9d9be39f602…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 15:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc9be73a5adefff5b530253655a612fc SHA-1: 04161e4a746c0a464444e181d24207d3a9613bb2 SHA-256: e224a9d9be39f60236abbea085503bbe2617842b4e5d8d20c1fa5bcdb6ca6466
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 malicious PDFs. It also contains numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://krisoc.ru/uplcv?utm_term=play+flash+chess+against+computer PDF link annotation
    • https://foodsafebox.com/ckfinder/userfiles/files/mepinozaredijelena.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/netodule.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b92bee010---54191092491.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/77694462982.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091209205633293.pdfIn PDF document text
    • https://thehouseproduction.net/file/96840678812.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161303c5e4709e---gemanolijes.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luwet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330105ee9c9---xoruvajopuzotowujenalaf.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/vagarirozifabipebupuzogab.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/tixogudutut.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/12821133579.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/zasisuwel.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/32986475143.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/12629093227.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/94890449892.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef0a69b87---55584726251.pdfIn PDF document text
    • https://htchninc.com/d/files/tamodimuj.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/kazagaxadejonijurex.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/ziruzajag.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/bodasakutelaxa.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/57471590998.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/wupasifulitulalamawufo.pdfIn PDF document text
    • 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_off0000d5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 16624 bytes
SHA-256: e68557bc61a5f5839a53bc8c7f75065e9e202ec4114e7bfb370d9402a97f7560
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 11144 bytes
SHA-256: 9df46807e3580068e4b6ec3b7d787b9aa6bd58bebfeb39a4a9346ce59dc65fe2
font_02_sfnt_off00011a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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