Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d0f6d268f1bb59…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 16:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 624d49f8d6989d7946c8a003cc2e5dc9 SHA-1: 20c3553fef089f9b4877ff8b72b96f04ae39535d SHA-256: b4d0f6d268f1bb59b3ae0812fd14ec9ed4c69540cf5e7ea396b73e8f68240bc6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://esejsc.com/upload/files/26515167051.pdf In PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/lojogefigesizimop.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4f3a1574---61003033597.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210915_70731759CEFA76A8.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/66297831859.pdfIn PDF document text
    • http://katela.net/userData/board/file/gilalaxorobugozelesu.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/17715109972.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/nejafinutewagavam.pdfIn PDF document text
    • http://generoussecurity.com/uploads/tabig.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c784a9bcf0---nunevixemaxube.pdfIn PDF document text
    • http://jn-zhsc.com/upload/ponofokakokovaledego.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/lowofufajedijasam.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133346e57996---88819648843.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fc3675789---larorifegewubitogigesav.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/tjlppm07inog5pnordpm1atvp4/38701703670.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/1464981266.pdfIn PDF document text
    • https://jotelek.hu/files/file/lojexeferibinolaledotadod.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/43770926845.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/41298177761.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2687893e---34076182741.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/lirewalekedifufuk.pdfIn PDF document text
    • http://glassick.com/userfiles/file/68809792432.pdfIn PDF document text
    • https://ocw.tw/uploads/files/rovatolozuxegozokoxewaz.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/27850243118.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/58098837878.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/bojelurodegududov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=virtual+villagers+4+apk+modPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140102d6352e---20443423007.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_off0000c797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC797 10936 bytes
SHA-256: e9184cf2bcef7aadedc3b91521cd4b630886db2ab0368dc05894c5603d94f677
font_01_sfnt_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 20444 bytes
SHA-256: 427a8ba8a29ea2abc2e5b4d11119ca3bb610cfb8364090fb1560421b540a61c2
font_02_sfnt_off000114a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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