Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc419de858422c8…

MALICIOUS

PDF

88.5 KB Created: 2021-08-17 20:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 75b8ac3e9fc70c3a094f7c4f07952cb0 SHA-1: 90ce1a560b9f65071dba1cf3ff54da386ddaa1e1 SHA-256: 5dc419de858422c80f5fb7b86e84a7100e4e0507315ba93541c00a733c4d7d55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://huefpdf.org/upload/file/woxidozuj.pdf In PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/a4quo5m59ii7ohbufhriuv3831/sezifokowitakafupenal.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/lukebije.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/81afcb220090a8a85f24e88015666636/72936333783.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160748b3965911---72023271709.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/77059124688.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/talegefawexiwoluvedepe.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9999bd5b---jubofivusiz.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a866621d08f---20594754820.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ecfecce5bfd83344fdf7fa265fb88ef7/9397200102.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/lipuxuzir.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/mofolikifizajeberosebud.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/47802352113.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/64810904245.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/30049447662.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/10510301716.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/404ab10875acbcb542f39dc64ce44510/49658800196.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/nesavifukufefuxi.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18a42b310a---81943208769.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/64be6db47c7b3186814b1cff682fddab/mikinajemozakatajafatebaz.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/a878a1adf25ca3848b955dd8c84d380e/nimisutuxemora.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mj0pnigaski2bp031k4ra6vj56/nozovijoliwerep.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/zivafuxil.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58211180a6---8676028329.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/82074841523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mesleki+ingilizce+kelimeler+pdfPDF 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_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 10728 bytes
SHA-256: ffc35e644dc30a48b3f483ceb699b0967079e7791292e6fa50e4a3256c9fa793
font_01_sfnt_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 19980 bytes
SHA-256: 836d287299578d225407df3985fc1d5761cf62b2096442608f0a4551fd62c45f