Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43781082c9c30f2…

MALICIOUS

PDF

133.6 KB Created: 2021-09-12 13:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c187bf2285158d781bcd4efe83921fdf SHA-1: 972751301220c278fa521cb5ade279537702bd52 SHA-256: a43781082c9c30f2498eefc05edc522ca4a104cda185e6b5cf5c73a920f4993b
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress upload directories. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final destination, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mabo-meccanica.eu/userfiles/files/83106567418.pdf In PDF document text
    • https://lifeteacher.tw/uploads/files/202109091230597809.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/51887352757.pdfIn PDF document text
    • https://webmenuplus.com/images/file/baziro.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355ac68d519---miforebazasujosu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e02e97f6---6026956392.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/davozafexurumekominuzino.pdfIn PDF document text
    • https://hgb.se/filer/file/34244624891.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/36642524775.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/gosuzaxim.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/57764779858.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/kodomesejebifeloxe.pdfIn PDF document text
    • https://ever-progress.com/upload/files/78258662010.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c02e8f256c3f4213a558abf5ccac1518/vodagasasazep.pdfIn PDF document text
    • http://nemochem.cn/upload/files/rudataro.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/watapewivajim.pdfIn PDF document text
    • http://dnepropress.net/files/file/nokafupenadanum.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/62511291184.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/9ffp0tt4ap3inglqu1am03o266/wimemebowitaru.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210906_8D623929EBF774E4.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/54754252411.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/66187032766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cs+1.6+steam+cheatsPDF 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_off0001a77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF92 10348 bytes
SHA-256: 91f92a192c8015fb10afabb7f397ffe9cd7189ae3648d742df5d52cb57d327ba
font_02_sfnt_off0001d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D704 19012 bytes
SHA-256: fe9c98de2f616aeeb435b123fbf955c56e27a040387f411392c334fbb7e6caf7

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