Malicious PDF — malware analysis report

Static analysis result for SHA-256 89eb4bc7bd0ec786…

MALICIOUS

PDF

93.6 KB Created: 2021-07-20 22:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80fc7c665c98370564f2d2278238d9d4 SHA-1: 29ddd67cfb734697c7772fd51f4bc9580a8c9882 SHA-256: 89eb4bc7bd0ec786f298f9f1efe5a65837c02ea238c2186d88b1574900245492
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL analysis point to a malicious PDF designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6d81755b---bomigivafu.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/sezejap.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/zosirew.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1933_20210611234841.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/1286144193.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a8168a30---lifigetipamolotag.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e9d282e7d---pejewinegope.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8d3dcc4e4---xarubidugelesefejotinubus.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/26858923370.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6f55b9ac20e95ae4c83dc17e3baed463/61636377727.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/54346643046.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/doxiw.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/siputumo.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/rbu24o079l6sm3710mektncm09/52880109771.pdfIn PDF document text
    • http://calisnt.com/uploads/files/36936168404.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/90602613821.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/kajipida.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/cb95d4e32afbb716679469ca4d406133/35595435789.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/xuzedub.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/labakozewobodopasewipid.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a71543c8f7ff0cf9251881c160ff258d/xovamib.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/dovekuxod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=linear+equations+in+two+variables+class+10+extra+questions+with+solutionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 20132 bytes
SHA-256: ba5ff1d2bbfe4400b4573593f1e5200e8e30ea15115fb2204e59494814fcfa6a
font_01_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off000135bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD6 11100 bytes
SHA-256: b9c1b327696a9d474f44b03c1b94dc4bd0f80ce7238038562dab08067dfc9fba

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