Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b927f9df00c779e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 23:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dfb8ea7bce75e3d8b043da14c49e2e6f SHA-1: 61d099612fe839430a6c37c7f87aa778f9d728b3 SHA-256: 1b927f9df00c779ed7a24d40bcda5ea8ce8828d7ad2a35386907dea5a0c385dc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and compromised CMS uploads suggests an attempt to exploit user trust or leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g8k0cjj3r3vu0v1en4sv1pl464/94450265903.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f24b9ce14874f1ccfd4621f701fb30dd/95216912909.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5f32a7b0a26a3a63a0b0d272bfb51ccc/13387750644.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/92115265998.pdfIn PDF document text
    • https://elemonbg.com/Files/File/visunulibamelofisi.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d432c0919cc00f85bffa0b63a71aa76c/29465601117.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/wolusavutepewigon.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/98682312507.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160938ba1a5644---sowibenu.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac9a7d4e9e16166abbfaae40e3bdd4d2/68455687313.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/41784639378.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/mukezexuravi.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/lebiwogeguxuj.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160907a829fe28---44475544918.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/e0e7241de4b45ab47fe6086b28e5754b/kalunifubitijonigel.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jevuzosipobiwukuses.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/32416442585.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/nixupokuranor.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d81508be6---nobuwamowirazorime.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cc22cf98f---kemuninud.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/21456591958.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/bozazimibotogujewumor.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982fcb421c7---jisinojefisirofizebejibo.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/45676678008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=acquired+hemolytic+anemia+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_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 17928 bytes
SHA-256: cf63ba93532418cb38f14fe3f4455ec096b533b14edda96f2b0c8dfe26f826fd
font_01_sfnt_off00011aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D1 11060 bytes
SHA-256: 93e458fcb4b840e11c601b1c6ed5cf8c57b3263db9bd7ce4209ab42221b50ce8

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