Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b8e7ace8353147…

MALICIOUS

PDF

108.8 KB Created: 2021-08-12 06:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0637465fe9a015bed8b889564fc7ac6 SHA-1: 6b63e8a15e0c1d8af519d8afc8f10a9b689e28e6 SHA-256: a6b8e7ace83531476b622c12778f643d70e03afcd04f64e42b98ea75bb7cb38d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting it's used to distribute further malicious content or facilitate phishing. The presence of numerous links on disposable hosting further supports its role as a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad761e1de---35959865266.pdf In PDF document text
    • https://tsegypt.com/file/busodebikopazetadun.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8e2ba151f---32118301557.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b8755026062---fafavi.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9002ecd6c370e9facccd4b2d77be8e6b/lodovimemotage.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8c11d13e4---xosomigupikid.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8e72fe90---bedokusuvexiwesojozena.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/26893884051.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd96ac3b3---12706500785.pdfIn PDF document text
    • http://qa-whg.net/upload/files/megotugamezatalogegox.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/58184076925.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5120b011bd---jutebatavenumunemadejek.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088ccc86bc4f---tarigu.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/13280706369.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/muxopin.pdfIn PDF document text
    • http://4bx.pl/public/file/gepuradijigetisudodijagu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dee8a9fb48---10858368479.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2604d3917d448670e153e881725add09/16406214684.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/fakiwoze.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/56c2762a1a700ccc3da6c97fbd5a5c23/zarogugipusoxusip.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abffc7c4283---96883748454.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/e248f8fb79078cdae48f930072b229e3/tanewagapimi.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/22268482127.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/17436424554.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/95209315408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tencent+gaming+buddy+chinese+version+7.1PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010375.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10375 25948 bytes
SHA-256: 6030972134319c298f12a31ca8a9539839bc6a2e636e9b4ab9c2136e8c934654
font_00_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 1704 bytes
SHA-256: 4399651035424788af89a61815135da753d7a2ba72e38705d6f444edb27b28e2
font_02_sfnt_off00013229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13229 23808 bytes
SHA-256: a03dfab413ea319bf5d598ef43f1d545e517ed6bda5e1eb14c4b46d018e25cfe
font_03_sfnt_off00017258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00018a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A6F 11320 bytes
SHA-256: 1837d7cb5e9b7bbaf80c2bbefc25ac53a0a49dd29628f6ac65956199643e845d

Open this report in the interactive analyzer, or submit your own file for analysis.