Malicious PDF — malware analysis report

Static analysis result for SHA-256 c695de1d237217de…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 12:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6734b94970bfc69b86d7f6214119bdd SHA-1: 4c8fa734e7ce864a69ac2db41873fc38b2956694 SHA-256: c695de1d237217de1b697078a9e2f40e70deeb60078b440c8ddf26cffd59a596
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sowiik.pl/userfiles/file/molizobegukevisadubil.pdf In PDF document text
    • http://plise.org/userfiles/file/nudaruwagugikagixadukeji.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/72872088073.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/80412341817.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/37156370623.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/taxaf.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/zunuganuzetetakovupo.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/45656850165.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/67477928528.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f8db296e586bded0f156abccc46c30f5/basukunevenojebevixogeve.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/66595450785.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1956cbdc4---89748019661.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/8392649211.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/1595186499.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/95396606557.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eee536c0b7---40724518054.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/melodajot.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/dumigekugulelevi.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/56803518774.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/gebolewogekur.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/55643565581.pdfIn PDF document text
    • http://apex-architect.ru/images/file/wenibomojomujadux.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/mepijewebalumeladoz.pdfIn PDF document text
    • http://hiniceshine.com/upload/dozoxitinoza.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/zetakefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=guyton+latest+edition+pdfPDF 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_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 18528 bytes
SHA-256: d1260c5fef776cb482b971e620ede8ad857b2cef6ca88f9c1dc858e23fa53551
font_01_sfnt_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D11 10644 bytes
SHA-256: afcebcfaf6c1de906cd34fd66ae255044efabc5bca11021f941789a79fe66cfc