Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad991fcd765d1f3…

MALICIOUS

PDF

102.8 KB Created: 2021-09-11 05:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 601b49bfc6d7a6c21e3b6c71ac7b40f5 SHA-1: 1522bdf4768bb87d2f6da8721dd7110ba63cd92b SHA-256: 9ad991fcd765d1f33f5321a9abbd737b6e509322431e5fbe34b3206688007a2d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/10d03b16ce9829ff1524142187540b9e/22997121495.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e9a1acb71039344d0e4e7ad7c2b9f53e/35095174667.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c996f24884aad39918111cf7dc74f211/zajebekawe.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/8432716251.pdfIn PDF document text
    • http://poliinc.com/upload/files/10859608694.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/41798514417.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210906_145934_100.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2334ce019---24998020499.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/26241121430.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/66481770706.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306c6594bf9---28711762948.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/71422639032.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/jupigupobi.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/54263216364.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/nivobunarirojinove.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/gukuz.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/fejumonifojun.pdfIn PDF document text
    • http://futboltotal.net/images/files/fevazasujiluseda.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/nibixuruzonetubotif.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/27880849906.pdfIn PDF document text
    • https://virker-ikke.dk/files/tafase.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/dibepun.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/e599feafe1bf31c0fcd690d073be1705/novonebanavisolit.pdfIn PDF document text
    • https://irrisyst.eu/files/file/wufetuberefafazifokagozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mi+note+10+pro+custom+romPDF 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_off00012b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B58 18888 bytes
SHA-256: e8328dcbd04e05afd0141c68a6a64331baf76acc9a828bd8f7438c531c71faf7
font_01_sfnt_off00015ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCC 10596 bytes
SHA-256: 60c8da5dfb6fafdbfb03f7c6e3758c4c6227c300e780942b78d2eefbad736076
font_02_sfnt_off0001750e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1750E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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