Malicious PDF — malware analysis report

Static analysis result for SHA-256 820b1ee60258a57b…

MALICIOUS

PDF

340.8 KB Created: 2021-06-28 15:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3ca7cfff29fe85403e27e1a88f578350 SHA-1: 1d81a5febcab783e6d814734e601ecbfbdeab200 SHA-256: 820b1ee60258a57b7ecd9f2d61bc9c805da4f2505146abff6f6b0dccac3c20f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 5

  • 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.
  • 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.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4d84ca7bb---328398956.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3e2e031c---32089206602.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0pde0dakqrhj5f3ottvnvdh484/givixaxiwekabibaxe.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/3okbcm5q9dihe6cajiodtlsjn1/56913907095.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/05f7b573b41a91249f9643f07184862b/pumezopaxiruferikitarux.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c47d8777cf0---samubajumofu.pdfIn PDF document text
    • http://riph.pl/userfiles/file/59936194584.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/045ff4a4b35e2ebc2682f7b6ed0b96e0/jisun.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c28a80cb8---63372842823.pdfIn PDF document text
    • http://szpk.hu/_user/file/28147712075.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5cdbb05d5a3adfe543f120322e0552db/bepexanakotisuvofevoxu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/bademulekiv.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/mopububogokubulitewod.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609083b133932---57661867379.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/409bef5306db2c302f7d0e0794e0d452/5737382394.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/40810783614.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/eace69d40875e5add73d1ddd9a8a3d45/79660064143.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76cd02b02f---takujigazulubobagodatib.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/a02f3ff46fb31c6244b681075d975326/55986034935.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a82731d259---nixijado.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/tilifinuxedisojumexatezaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=idealism+meaning+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0004bf26.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BF26 21304 bytes
SHA-256: 8254b00d0328f40aacf1bc36d3171aba29cbbd6d12a785fa43518902e50a5d8c
font_01_sfnt_off0004e419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0004fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FC30 10328 bytes
SHA-256: 334e9ccbd119ca4f283287a28039fe79b884173c25ae926cff319a3e503644ed
font_03_sfnt_off000512f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x512F5 18684 bytes
SHA-256: 0608b55164ad3d4e44423db71e3aeadcda24035d7f95bac46f496be9d0ed532d

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