Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad5b50fecc26298…

MALICIOUS

PDF

106.2 KB Created: 2021-09-13 19:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fbd8b1ebf356b97fe6d308c6fc8e0457 SHA-1: ba3f7701672ace53be7ce9cf9c92b8dd5ad891d3 SHA-256: 5ad5b50fecc262987291994e6c0f915655225cad46d7913d4e4c932e7590bb3e
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 websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://atenngo.com/admin/sites/site/documents/sibet.pdf In PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/26289551204.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/80521425463.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/puvegena.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210913_A162DB300D27A9E3.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/7728c515b04a4e883d1368f5b7bf4467/56526276004.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/xigizolupumex.pdfIn PDF document text
    • http://ciskmv.com/css/file/71010288346.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/vadiposuzodediguj.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/gineduwukixiku.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/marejem.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/21610047032.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/towefemoketabag.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/75705084885.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/11427889431.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd55ae254---2014230680.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/37765854030.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109031315083998.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5e9ea3ca74883e23cba89d4e569d64f7/tijamubux.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d256c4ca7d---dazode.pdfIn PDF document text
    • http://status.cz/UserFiles/File/16572673951.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613328fc5aed1---nepogifivivumodozabi.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/lexegerabuxagewiboxemobu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3dda194420b415993e42561a3c4b7834/giziwegujutewaru.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/warenuravile.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210907095729_1983782584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=list+of+social+issuesPDF 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_off000136fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FB 20112 bytes
SHA-256: 384ec6491b688e6dbcd42e485a8c8cab6ca8fc7f318c12843695b75cbe5d547a
font_01_sfnt_off00016b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B75 10180 bytes
SHA-256: 93e27c6c5badce07eac6277b8ed12e7ea12ab6e2a53eb232db8711badd65080c
font_02_sfnt_off00018276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1