Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70f4dcfe321ebd8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-07 08:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 111e20be303490491820e04d0917d8ac SHA-1: f24ad3436a9509cde7cf32ca57b6d4c29691c4ba SHA-256: d70f4dcfe321ebd8fa121b9e9de6882ca6c09bc81390085ab74ec2e93c6cc115
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to redirect users to potentially malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://nomylo.ru/uplcv?utm_term=posmodernidad+arquitectura+pdf PDF link annotation
    • https://xuantruongtech.com/images/ckeditor/files/88980094864.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/fifavobuvagaruxegemerul.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/aa0fd56590a8114025fbf8582457fa7f/sizatube.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/xokolimufonifujanezaza.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/24711448428.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/rd79h73rfo19bhhndlodpb3a63/gamajipedevini.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/66207208426.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087ae8862253---wedamokekim.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c42de04d3---duxewanud.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/baluviset.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/guvowoxevamuvetawugolibum.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/96414828645.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/45636736114.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/siwifobux.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/fc3e8a2199765203a752a4ad4fff9dfa/genuforuxoboga.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/8271340636.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1072a402c343ff0e4f2ecf6c59138fad/judenaxoxoxerekuzegudutik.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d35f15088d---29320952772.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5d8157f0---noroxotexulasuxajel.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/tamolurifejosubafep.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/83706255874.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/gejosezezinesale.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/6993864750.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/kewovuzexazexaxa.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/81959212961.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/durolaxuzaziges.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/pusofutoxirijerovako.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_off0000bbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCE 15916 bytes
SHA-256: ac26ab30687e2aae9b1c61b1dd15d7eea1c5411459b59f02c7867db084d01301
font_01_sfnt_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 10984 bytes
SHA-256: e13bfce4c7535992c169154db2be4625ab092b9217268b17df4cac85ecb8be67
font_02_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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