Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98a90bde57cd348…

MALICIOUS

PDF

141.1 KB Created: 2021-07-16 11:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26b89e58988c9fb6f956332de6b941ed SHA-1: b23a05df7b595b925a0810ac72b98fed813d1369 SHA-256: a98a90bde57cd348aa1016b60b80d07c8acc36a823766790159d9b8d1a5dfb03
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised CMS platforms suggests an attempt to obscure the true destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://sun-eko.eu/files/file/41366624820.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f348e0bf34---37879811809.pdf
    • http://softtox.com/new/userfiles/file/10781265809.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1badcea95---sanuko.pdf
    • http://vyveva.eu/UserFiles/File/nemaxesaxinojir.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160be714266bfe---85513018199.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0c3897a4c---vexavof.pdf
    • http://greenvisioninternational.gm/userfiles/file/71243326660.pdf
    • http://rioairporttransfer.com/ckfinder/userfiles/files/wamobakegafawipivesaluj.pdf
    • https://oncetrabzon.com/resimler/files/50351934987.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/51518024628.pdf
    • http://dynamic1984.com/user_file/file/47503626268.pdf
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/wizebawajolibipekafedo.pdf
    • http://moskvaznaet.ru/upload/files/boboreletemij.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b348ebd8caff3a3760fca41a2cd11872/tisof.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079a327c4dfc---karefeked.pdf
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/90633880948.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0fcb60e8dd---jefebomefolinopopote.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe7bf1df9---xuveludefala.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76b73990e9---58242201072.pdf
    • http://avsa.org/sites/default/files/images/files/nejozi.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nnmd387rpm9llfgvqqpekpc1ps/75470786075.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=undischarged+insolvent+meaning
    • 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_off0001c7e0.bin
2394192113fd8183ca157e8c5f6a6109e675293488aa7afe378b2677159ca83a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7E0 10892 bytes
font_01_sfnt_off0001e0b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0B1 16792 bytes
font_02_sfnt_off0001f8c3.bin
6eab294146d9f16874d168c8abeee50b91f070a4605cec2ae691651842e6ab86
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8C3 17092 bytes