Malicious PDF — malware analysis report

Static analysis result for SHA-256 5597856aec89e9e2…

MALICIOUS

PDF

71.6 KB Created: 2021-10-03 02:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 18310b43fb59fa8245784f3fd0be1352 SHA-1: 266136ba29153759be9db2bb6861e953cbc8d102 SHA-256: 5597856aec89e9e275bff373c3f1426d45b548db8bdd2a50487a6d48859b52fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://synerhu.ru/uplcv?utm_term=anxiety+coping+skills+pdf PDF link annotation
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615061a2f4120---5609456081.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210901_8B5409A74ECFFAB9.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/47159715474.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614069f202617---rikiwe.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/75569375617.pdfIn PDF document text
    • https://kimcert.com/E/file/sagukexexilelozeriz.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/49404705390.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/suxodudagaxelifibiji.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/91900432886.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/52379359538.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/repiganud.pdfIn PDF document text
    • https://edusfera.pl/upload/file/53649517999.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/tesepejogagejud.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/50161812036.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/76901841649.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/rozuvun.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/sesaxovajenogozo.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/40259145258.pdfIn PDF document text
    • http://wdnederland.nl/file/76906573271.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/funederelitanisole.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/da229f09639195296c57f9237021cd66/66012163528.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/94067894862.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/70598460547.pdfIn PDF document text
    • http://tercovci.cz/files/file/pemukuvopu.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/vizete.pdfIn PDF document text
    • http://fgosvo.ru/files/files/85426469948.pdfIn PDF document text
    • 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_off0000b424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 10824 bytes
SHA-256: ecf7897c900163fd9d0614f530466896347e37fe11f23023f2a1d56d942f2878
font_02_sfnt_off0000e52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 17032 bytes
SHA-256: 60e5b11322735cd2e194f3c15e12cb0cf09f415019461fcd180c3f113090b0f8

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