Malicious PDF — malware analysis report

Static analysis result for SHA-256 4388dd93cf7992fc…

MALICIOUS

PDF

83.1 KB Created: 2021-06-25 21:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48849aa3efdbe0783d9cf8ab7fbb4489 SHA-1: bfd9a9f42e7971f08b0b928483b13ca37cee730f SHA-256: 4388dd93cf7992fcadc3711da539ccb5102e9880b24621bd1e6cb1a3abe35f53
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories, suggesting an attempt to distribute malicious content or redirect users. The PDF structure and embedded links are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/08jgcrt372m4bq6k5acvqul729/jigudowu.pdf
    • https://abeess.com/userfiles/file/zomobojozabigitivirew.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c361b5eeb45478e2fb7a14ffc8ff7228/kolojojoxitaguzopidebesa.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ffc50a72c57d415669966a0d2df0a52c/16323762341.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7d927bc1---kijimezoj.pdf
    • http://cityclick.it/userfiles/files/17487948747.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3bda1c930---65088943513.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427c8da812---70837847217.pdf
    • http://ghalemdi.com/userfiles/file/burarikezupetitojakani.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4kgdukdab5932kt45k3bmh13i0/wurokul.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b836b51c912---kanenajawadunonewiwenuvu.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be31bf73bd0---tobozit.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780bb16d710---ziliwogaroxarupuzoj.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/d1f4fcbe29b642b3acb3f2868f9520ec/88422394990.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/t4rrqe6fe1ueppo7rikrpvksi0/kupadusefumufodeludataj.pdf
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/1222830894.pdf
    • http://aliglobshop.com/userfiles/file/fenovega.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/432f7ea645cb120169a855923393b32b/35112051626.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7055187234---toperu.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/b4bb0ca4f7fbd49097b5391d8e0304fe/10858087077.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a219d9f8c1---pomasinegukuwogemusivi.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/fl2dr7p3jni1fus5efm72i9o7a/97908995366.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089eca44d882---penugivimidotexofotil.pdf
    • http://amphorabeautyclub.com/campannas/file/86468173806.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=oxidation+state+of+sulphur+in+sulphuric+acid
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbfd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 16792 bytes
font_01_sfnt_off0000f40f.bin
d11e9385c8d1bc5d9637b81e52c2d77583bdf5f37acd8777c6e63628607fa6af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 18816 bytes
font_02_sfnt_off000125ba.bin
2ef5ac7854e1ad278ddae839a6c9b1a6cf6b7d90967b4923f244b2093e365c38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125BA 10944 bytes

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