Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca630b6e8cc4f4bc…

MALICIOUS

PDF

76.3 KB Created: 2021-07-01 16:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: c41a3698671713744279248b04723c86 SHA-1: fcca45c4c37b30df372c843a6ec6a75a695b5650 SHA-256: ca630b6e8cc4f4bcedcec55e60dd14341a4495efee9ba7d59142556edcf09d40
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier flagging indicate malicious intent, likely to trick users into downloading a malicious payload disguised as a bank clearance certificate. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6965

Heuristics 5

  • 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
  • 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://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/39999947738.pdf In PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c1d91e98---kolegojopapod.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/veporuzugogubozap.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/2967a9fdcfe0ec864551f3e22a3bbf14/babudajokiwodejebupuk.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/687a751f5a846072da5369f14ad7b3fd/91293718798.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/21758418962.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/ninawoxideviwawivivixu.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/jobulagegelabasa.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094910e59b84---juwemolasotomewuwarewekoj.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072684edd282---28481246226.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ede59801---61325771810.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/boredaxoferaf.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210520051508485490x9bpb5.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/525bnjhn2mbviobt0uh4i63abl/53662781357.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/57480984391.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070651ca835f---60607072592.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v6dgmao24kv61p0c79ubjrrnc0/43020684948.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/6475595306.pdfIn PDF document text
    • https://hgb.se/filer/file/10880885045.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c815e6ccca---puzisasanosivupibopired.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a6b01eb44504b1d43771ad15d7732f12/fasawamifizefapolu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/omvvonngn09vaak75j8vrg60a5/70902516459.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/vuxozirovajuniz.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6826368d50e9f928e33a805b4aa1fead/wosuximefavometuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bank+clearance+certificate+format+pdfPDF link annotation
    • 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_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 16952 bytes
SHA-256: 5ad156966771c2c1759f2361f9deb6ffd2297e5bd88642619a36dd74373f4423
font_01_sfnt_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 10756 bytes
SHA-256: 0bfda7acf9377ab8f3e604589684e12cfd9e457d2ec93c9d9dfa731657376960