Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7b8fc67c3fad3d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 07:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c665dec2e197547320e97520ce4a251 SHA-1: 68810623619e146e40b8bdc82b920dd06fc1ae9d SHA-256: eb7b8fc67c3fad3dcf01ccabab3f028d03de3c5de3f91aa56e3504584154b729
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of multiple external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://hz-karavany.cz/ckfinder/userfiles/files/suxonobibekomebotu.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7f7a2e45---35912651283.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/9705824205.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/96039966906.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/62950674737.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/20632937691.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/20631536922.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/jirofiwoka.pdfIn PDF document text
    • https://spacio.hk/attachment/file/83138114726.pdfIn PDF document text
    • https://bloomeng.com/uploads/95759793827.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/309f89d9f69ef3cd69f64fa668d4a8e1/30773023279.pdfIn PDF document text
    • https://airbays.com/userfiles/file/zirux.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cd064672d---zugijegurew.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/95188356033.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/33591961907.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/fezajidiguja.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-19/20210619162304487031.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/gosuvojajudusalap.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/mapikukufevunukolufasawaf.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f7af98104---keziwigudo.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/panonesazifesegiribexigod.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/bewir.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/7jcerd12uo7flhsashl39m7ao0/wozelapibariwakela.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1626612812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gibby+icarly+now+2020PDF 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_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 10444 bytes
SHA-256: c730e65cdc7526e554aa52de0c823cdbccb32dd38e659f2ed0813c4f84856473
font_01_sfnt_off0000fa1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001122c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122C 18840 bytes
SHA-256: c46772df5441703eb7514df143240c7b56d224d9bb56d6256ed662249b55f618

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