Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbd146c264e301e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 22:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21e7e0f2b15230745b39a0931768b57d SHA-1: 9f3faad1482ab663e2a101f1f255f3d00ef3685c SHA-256: 0cbd146c264e301e54ac5a6cea45fe6bb6327810161d65dd7894db31f24ca73f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and embedded URLs suggest it is designed to lure users into clicking links that likely lead to further malware downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/a632b8534c2470d86f01a933157a424c/dejubemeduxunikatiro.pdf In PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921d3c66751---totikabaju.pdfIn PDF document text
    • http://chouchoudauphongongtay.com/upload/ck/files/mozubevonurolulasara.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/374987e4aedf13d556153c92b1a83d7b/29422743912.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43886361700.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ds988c93n210g8gbrjhq3rd2et/80766303212.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/77c0cad7ee043fed4839517b29af5ade/duwunajetefofiwopufulapu.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/jumidaxazekado.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c697cfbb135---pepuze.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/40850669424.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/9999291410.pdfIn PDF document text
    • http://kme-kme.cz/files/file/valipomiluw.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/18125908761.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/zusidogafowaned.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4c7f2510b353aa0deab346918cefc496/38980787574.pdfIn PDF document text
    • http://ilkemymm.com/image/files/63175188234.pdfIn PDF document text
    • http://maihome.hu/admin1/file/8515123012.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/lunoso.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/57092784011.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/81004866401.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105110628.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///jizefinodujuzuzirosale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=very+severely+underweightPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/vadotenesafulazubix.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_off0000d404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD404 16980 bytes
SHA-256: 72289d7694523a71e35750bf87e198083f5d24387c52bf4ebeb2e091e79e9abf
font_01_sfnt_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 10580 bytes
SHA-256: d242af2bf015fc9c8b70bf8b07bb7844d6354327ba76789ed89c525035b16789
font_02_sfnt_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1