Malicious PDF — malware analysis report

Static analysis result for SHA-256 178d2f4ca6d86593…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 01:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c469846a1b6c8849e03f266b696fc487 SHA-1: 0eb7045da413bac2dfe3c5580cec14129351e550 SHA-256: 178d2f4ca6d865931c203026a156084f339ac731c54a9a671db063434534fe3f
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware delivery attempt. It contains numerous links to external sites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to obscure the final malicious destination. The presence of a fake CAPTCHA heuristic indicates the document is designed to trick the user into interacting with it, likely to trigger a download or exploit. While no scripts were directly extracted, the overall structure and heuristics point towards a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ldvlek6vdamh64ic4iore0bln5/xetopimisa.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138877e22d8a---9792829857.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/torigaduwugolog.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/96336582626.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/43831847226.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/10084120299.pdfIn PDF document text
    • http://ed-union05.ru/files/file/75208431560.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/rufodejakafi.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/zumuwikenewulevomurabisa.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/66455200358.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219911021.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/waziwowifonox.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/lexararez.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202191455836.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613157feb468e---39517065245.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/sefosijarokawarig.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/muwelupobabirixarezur.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/33961512631.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/76943479407.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/5199882264.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c5154ce2702c82ba543b5e745e894bd0/61743949182.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/zivojejiziwino.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/74036474425.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/sojajezefibonusajuromo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+diamond+ml+apk+legitPDF 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_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 10636 bytes
SHA-256: e1552f67682450b56de844e3e16297ad344b46dc1972824ac3a348e99dfd8eec
font_01_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 17376 bytes
SHA-256: 0a6ae66d052a2b04ce12f8cf05f443459ef7013bdbb9cd107a5d624f2c2616e3
font_02_sfnt_off00011ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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