Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12b56f0b93b9c50…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 21:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de5c206f9581dc0a9e279cdd2a12f9d2 SHA-1: 9d694e1afe35214f369854dc3fabf4a2fcb51ae3 SHA-256: d12b56f0b93b9c50f925a7c6b93683799eebd8fa900f8a88853c6cbb67479774
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://orderpoet.com/ckfinder/userfiles/files/12548388299.pdf In PDF document text
    • https://karlholmbygg.se/UserFiles/files/segovejiravimedukaf.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa12dab2af---kinosawan.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/kulizot.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/gipapituganazamuv.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/73952219117.pdfIn PDF document text
    • https://ilo.tasksplan.com/userfiles/files/19560839439.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d183151d98---11744768069.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/55542142911.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/bisipijabuziwelubese.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/dulagawoxarebikebuzupi.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/wunikiwusubufazenibe.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/52020192218.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161477a694e943---82558848076.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/16999985488.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/xibiguzuxi.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/jaboxulowifevabugo.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/95510338562.pdfIn PDF document text
    • http://riversedgefm.com/files/file/bemofejupufuvojoxovob.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/31342719058.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/gemilebewupopoxidezonosa.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/8092659977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=all+beyblade+codesPDF 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_off0000b28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 16964 bytes
SHA-256: 467dffdc4f60ff0aec7e2a88d4fbaf9a45ddbba46f91dd2e0b77726ae87bb37d
font_02_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 10204 bytes
SHA-256: ae3b4632eb929d31b8bd9ec967453cbead4b7ccbf46b16515050c7caa2a22027