Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ddb828cff53d90…

MALICIOUS

PDF

88.6 KB Created: 2021-09-02 07:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e7f9315725ea5bf5691ef2bbbcf94dc SHA-1: ecb77275f7f11c34696dd6240cf3d801fe1e258f SHA-256: 38ddb828cff53d907dfa74cb57b34f4c01b9b5ad4a7da6d8718059aa503e7aef
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://powermailer.in/userfiles/file/kimukozefugerisebuluniv.pdf In PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/rewakilekireloxelibozox.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/48656125419.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/11543565196.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/78676524795.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/80720688392.pdfIn PDF document text
    • http://fabtur.ru/upload/files/jifovinulopufamo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084056a87617---bugutaj.pdfIn PDF document text
    • https://bdcomunicazione.it/file/tebazopolifedilokafopiwi.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/875677b6c84aa411ab74c23e244451a7/75440859773.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/roxumefirosawovulakotu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6dfd137829c23839432e1c9022074e99/22851141272.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7fdbf51a2df1c019211dfb3fdf9d244d/zabirasisidokatu.pdfIn PDF document text
    • http://accronline.com/userfiles/file/vavilamavi.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kemulomupelupopofegozedo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0f02ec513b48477f47e509b8619e3dfd/zemasafupezezot.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/lelapikezekarinidukuxo.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/8481334570.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/10976457972.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/fiwerivonelepabufe.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/xapowububi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/biwidutelanitanodaw.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/lakoveso.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/80052244856.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/fezuriluzevuwukuzarobat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=first+menstrual+period+after+birthPDF 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_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 17356 bytes
SHA-256: 5260b47405dc82ad1421d767c5b98097ca243abd2c1a07d971789901ad783151
font_01_sfnt_off000122e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 10980 bytes
SHA-256: 5ef875b662967c9a7a2caea7ae56c0f8a8dd1e37c8a3a56623345da969bcc0b7
font_02_sfnt_off00013be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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