Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b48d807e97ace0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 23:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 466c2a7a1b111bb3f4b790e0e410f63e SHA-1: 901ed50fc9c956da3a25c80aa72d906ba9d14697 SHA-256: a5b48d807e97ace0c1cd07cf926281c0a981adf2cac0bef304ae3aff7c482a51
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=happy+game+earn+money PDF link annotation
    • http://agro-pasz.pl/ckfinder/userfiles/files/62436213587.pdfIn PDF document text
    • http://baove247.org/upload/files/zuliwerof.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/53007706287.pdfIn PDF document text
    • http://cudicio.it/images/file/9724394282.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/86326843155.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/96817948797.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/68793162963.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/18142398466.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/13993173876.pdfIn PDF document text
    • http://jawarakreasi.com/file/lowid.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/22072723945.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/57289692314.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/31698327522.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/83096161065.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f38d962338---tuxuv.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/waxoluwiliwiligawupozir.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6996550350044b9a073ce5ff588dac18/bimevexemo.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/75918009979.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/16588958477.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef10b5ef96---3493665658.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/buvavoloxamugunazi.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/57164522264.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/4735533253.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/3973405453.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/fajuxuvumidum.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_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 18072 bytes
SHA-256: 873e3a4ad227e20dcba67a9c5cf72d3656ccabdbbde8bc1f96b8914d4b1a2ff5
font_01_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 10296 bytes
SHA-256: c9cdab7ebc40d9bc22bb01ad4e0c0f6145f145f295b1180982a0ed618b21544e
font_02_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1