Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6df02e7be1c0dd…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 06:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a854af385497f05c223d9b943975535 SHA-1: be72c19b75343ea937d9f1ecc3f33e94389bd1f0 SHA-256: 8d6df02e7be1c0dd9c336ea50fa859328e0d586e2e2dea522e6367312863fde7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites hosted on compromised CMS platforms, as indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the link farm point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ceabo3uu23d2aqs09lk18gq4jq/69471246984.pdf In PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/12128594752.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ultq0msceedcp42sa5t0bv8130/xurujemaroboto.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/zunuwobeviwetesosonuxunu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/98064659853.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/takaku.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/k1dk3uu5gcujm5dieae63h3i8v/55715560317.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2882a2347---72834836959.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e777b0b53---49119811968.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e17b551c5---24056798877.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/2037c4b8a776e3ae7d4c660104fc5dc3/54854465689.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/talaxisedaxudimupopejam.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/kigabagazetovif.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/64210604695.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/kofepesuledexe.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/wimejutapo.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/db0b54b76f58cf99d3a076ffe7356e7c/67167447686.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9n09n3kulssiekp25t8gmai643/44272369935.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/99608972988.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1184c8ba0---debofodelerajobaporupa.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/37138849558.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/86076513532.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/suzevowabofu.pdfIn PDF document text
    • http://chengzechem.com/upload/files/nuwoduk.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/92086299671.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202173114850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ios+swift+interview+questions+and+answers+for+experienced+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_off0000d669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD669 11020 bytes
SHA-256: 0a4edf19ad979f503fec56c8975cfb742bb1a6a22f85d7348e6fc3d62347ac27
font_01_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 17396 bytes
SHA-256: 24d55f1fb651eac14ace98d3f22b8dd43d8e23845d10a7f2b87d8ab5d048ebe7

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