Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d50fdee2a1bd76…

MALICIOUS

PDF

79.1 KB Created: 2021-09-24 20:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd477926b14841a5a3f5bfae18de618f SHA-1: 9746084ccb0cb864c4ed4bb265839be07371c82b SHA-256: 68d50fdee2a1bd76526f916dbe616666b980fec17b91213af4aeb8093ccace7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm intended to lure users to external sites. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=free+diamond+clash+of+clans PDF link annotation
    • http://4darchitecture.org/img/all/gajidonolutapujokewugob.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/jegajefatixokosateroses.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/miworupilekojusedorel.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/turixedolodozimiza.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/80835206837.pdfIn PDF document text
    • http://salt17.com/userfiles/files/zifafisadofomelisaki.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/rekenexuledirudulevel.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/40077217258.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/50440106691.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/kujojelidumub.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/44703821489.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/59755143181.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614123d7efaad---9479283762.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/rukoz.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612edefcad865---lababefebotepivi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161436bb15e875---jamexesuwitotapit.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/zadigenejudozafi.pdfIn PDF document text
    • http://candientushinko.com/images/file/16455344885.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/jajopokulavenota.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/roninovufegerutonon.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/28365991932.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/25522112852.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/58134859313.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_off0000ca40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA40 10620 bytes
SHA-256: 9fbfbbd5a264afd1251236202323367e267730d7e739981ad3fc86b9af0474f0
font_01_sfnt_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 20344 bytes
SHA-256: b04d28c577107978fbead0394f415d86ab2bd8e9c45e42e6a7b0d41bc9619d16
font_02_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1