Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd21dcda68cdd7d2…

MALICIOUS

PDF

158.7 KB Created: 2021-07-06 02:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a43a93a56962fa57c8c2a17738f2abb SHA-1: c9fb1f979156c044ad8feb024e4f1e3ebbe230a7 SHA-256: cd21dcda68cdd7d2e5f3f698039b772b66e7c0be712e60e145687db826d0d90b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links are likely used to distribute phishing content or further malware payloads to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

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://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c879544584---73055589695.pdf
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/50c2492a57018c3872fe5058565b7717/5214779281.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/4ms57q2m4heqhola0ahb7r4aip/betitewofegaluri.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ecf676d303366f3ceaf99105859c3ba4/99318383507.pdf
    • http://peak-experience-japan.com/bunujuzasewo.pdf
    • http://mediedil.eu/userfiles/files/gemolupodoxo.pdf
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/96625951143.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886b8f9b060---60492152437.pdf
    • http://aftckwt.com/uploads/file/jedebixaxevakapu.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160791d112008a---mojijijavuxavenapanob.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fa1ba843d---77008041016.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/fc180b74a0ef32ca22b125ce269dc3af/10908840849.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/bmdjqht1926oh94u1knu94iagv/fulopemiruxisenonidefo.pdf
    • http://robalton.es/Albums/images/file///solopixujizefu.pdf
    • http://daoltrading.com/userData/board/file/90683084355.pdf
    • https://alamansyria.com/userfiles/file/50461488303.pdf
    • http://elfuklid.cz/foto/Image/file/83877720016.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b23e9130142ea8724053cbd389f9c795/1191816505.pdf
    • http://autosoftware.company/autoresponders_images/files/zexutabowida.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704539f2088---wubapopu.pdf
    • http://generaltubi.com/container/ckfiles/files/pupejopuxavam.pdf
    • http://duocmyphamcongty.com/app/webroot/uploads/files/gezujexufutuxux.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/v2bnr7d7duiniko5bp43rhsncd/gaputerujedejalol.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607290dc6928f---jenukoratigufezoluz.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/57365213073.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=it%27s+been+awhile+since+you+heard+from+me
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f197.bin
450cf7fcd638e9f2ab9e925b507d09eea9dab3238814c0d384a717d7aaf13e38
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F197 3356 bytes
font_01_sfnt_off0001ff0e.bin
7510474bc6ae7a40e173210ed860a42efe18b782152099b0414515bd44389b8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF0E 24884 bytes
font_02_sfnt_off000239f4.bin
f5f7109396434054bc3471b9a929d1ba9efdea46e7101b5b478d0ecdf902b019
pdf-font-stream PDF embedded font (sfnt) at offset 0x239F4 11168 bytes
font_03_sfnt_off00025402.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x25402 16792 bytes