Malicious PDF — malware analysis report

Static analysis result for SHA-256 7312ab8874e14eeb…

MALICIOUS

PDF

74.2 KB Created: 2021-09-06 13:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2cf9d2fcd18c54fbf2ac5508800844ff SHA-1: 9922cfd3ce4d015c559c5cf049cd2bc32c95091f SHA-256: 7312ab8874e14eeb9b8a6e6e3977d295723ea32e26f2cd83d74c4bd34964246e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm used to distribute malware or conduct phishing. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis strongly suggest a malicious lure.

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 https://kuepancong.com/contents//files/lusumol.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ef1e8b11---pedekudojavuzumobobilut.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/70125942673.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/1btsdh8tnnfeq2fs0q82d735is/xaxijatokexefaxo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8ba855b0---dalebibexajamiv.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/85ea549baa4cbea41c08fd05e5968831/nisoganebedize.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/49208eeece41b3a26fb0373eac2b2485/nejapegun.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/6309132415.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a98da067934---6385254966.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/libazax.pdfIn PDF document text
    • http://apart1day.ru/file/68251037315.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210728160832.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/92574598521.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a328797f5ef---lipetipumegi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/27o82lcm742rhf3rsb4pem4dv9/tutidik.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ek5k6jmono55fib959l3nc5270/loruwupegavaben.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/busoxurosozewuwewivomagi.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/55386142435.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/072cc9b75ed5238d0be09aa34f4bdd5f/kapuwup.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/xaxadizagigo.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/xidikatotazo.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/bgfhcpsnt8mfjlhcmc2ui1nfqi/tebefujelopoxepisedegodi.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/aeba3ef7b4ef9456a0155f94270caba5/zikaxuladenipej.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d1500037a---45469299501.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/69954066838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=properties+of+exponents+worksheet+evaluate+the+expression+answer+keyPDF 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_off0000bced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCED 17032 bytes
SHA-256: edb3c785e9d50bd18dbc47e8e0a57f1835a010297aec23738bbd3eb86d1138d9
font_01_sfnt_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 11016 bytes
SHA-256: b21d4b447aa6b7f924ca09d25f8baec6655160ecc5f8d253c5037a1e08ca20dd

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