Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8d1d084d257348…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 00:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f64af7d2b11a1ace02890eaba3df4331 SHA-1: 91ea60ddc7ed0f73713428a044cec76444ff0c96 SHA-256: 0b8d1d084d257348a1d170a2331ec1eb085bd90c3c3dd71564ed370f19b1f013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links pointing to potentially compromised websites, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of exploitation for client execution, likely leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/uqrs9ivep1n7br8vbsarjknj21/1955372426.pdf In PDF document text
    • http://email-database.info/userfiles/file/fejodo.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/tepodamonokenetuvi.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24997174852.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/deketevukokukafosuxudunal.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/70627006308.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/7f6ikma8shfkanmcf4kp4qm1p4/gepemavujozoluzedokovana.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/h76eir14tkb2qsqbou8aka0t4q/8584945046.pdfIn PDF document text
    • http://aven.su/userfiles/file/mopibefegetilusogibema.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/1831509893.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5fd969df2ef907d122e9f03b4b920f7b/96765189406.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/75910207595.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e40073466---31107519296.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/62827747005.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac77c4ebfd---razogujazukixanur.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/1766454100.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/43783457590.pdfIn PDF document text
    • http://bscartridge.com/pic/ragowazifilumatedifafutam.pdfIn PDF document text
    • http://hodori247.com/uploads/files/44872617846.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210616132200_5escgg.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/22737037257.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/63944635844.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d814104962b08e6b4f5549b3ada13350/xupavosisibusumowil.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93bd3092c---46764789579.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/wasomojo.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/70330043906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+delete+secret+messages+on+messengerPDF 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_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 10700 bytes
SHA-256: 55433e1ea464b07930ba168b026f5e987244d8ec92142ee85732f22ff12e1068
font_02_sfnt_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 18144 bytes
SHA-256: 557b2fb4331add8baacb1de5e689210f88951b929b8ef9035312d50ea9bcd0ba