Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f330baa4aeca79…

MALICIOUS

PDF

69.8 KB Created: 2021-09-12 05:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b052ecca72372c37642b57d1a7d31d0a SHA-1: 85ddda67b82b175baff2b7bec4e359e33ae822f9 SHA-256: f9f330baa4aeca7936fe480c2a97961598f1d15f069a8c7a81cf2b6d2387f225
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=porter%27s+five+forces+model+journal+pdf PDF link annotation
    • http://tomasmrazek.cz/userfiles/file/2852791020.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/40087900931.pdfIn PDF document text
    • http://masonhn.com/d/files/ginapuxesozabij.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02c24ccea---23585620404.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/kefetivujitufijofimugugid.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/xuridabanepitarakave.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/gulejokaxumidurovuxopepi.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109091753373370.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138725ea7b3f---71650324777.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/93df576e57e7dbda35d7a5d85126e444/lejigejirutevulis.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/52844928173.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109041603225342.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/16887831708.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/57091501929.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/rutepovez.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/sawojigoj.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/22001640482.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/jadidorituteniwolewenebir.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/kenekixuxekobexef.pdfIn PDF document text
    • http://laserinnsbruck.com/static/wibemevidenumenunuje.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/8384727828.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/tuwipoluwirosesapinexajan.pdfIn PDF document text
    • http://gr-chem.com/upload/files/65871503527.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ffe3230cf762be5050dc82adff278f7d/51510003884.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_off0000b182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB182 15360 bytes
SHA-256: c45dd6cd3cbdb253b7db91d3fc62353316ce8b64c1c0e5311e371d628a94d73f
font_01_sfnt_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 11112 bytes
SHA-256: c094f8ff6f9f844656c2f23e7740f47b0ff9becd4dc4eed117b836eead3876c1
font_02_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1