Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a41fcd6dfa22969…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 06:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a515d49585b5f4227a08f42b5d5b4d64 SHA-1: 6e795da1d4d1c4fd93c4b985371cccdc0130cc4d SHA-256: 2a41fcd6dfa2296992f20571f41ab7aafc37b91e27baaf380effbf747cd6a6f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gujaratbusinesspages.com/userfiles/file/masub.pdf In PDF document text
    • http://medicamarsala.it/userfiles/files/dusitiwekobiselu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c0906f1f1---pidixebufum.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/35679476644.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa51407bf1e---64458473330.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/53127078717.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbc7d5ae1f---56070156055.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/66q5gr9mrs8pb12nvbper72ak6/9379842118.pdfIn PDF document text
    • https://bem-sa.com/img/file/18095397047.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/28483655509.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10a40d9cf9---zixoxazokavok.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/361bc2a9f7dc58590fa58fccd7829499/55393659291.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/faduzowuwi.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/nerevipimuko.pdfIn PDF document text
    • http://hainfelderteich.at/radimogoreloxolegabo.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/vikadumupefataturuwanag.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f4351daaeca88b9af80529f07c38638e/30482116797.pdfIn PDF document text
    • https://theurbanthinktank.com/files/80830123016.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3cdc9ebdc6521228c4f920ecd09a2cc7/zakalufamuwumek.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/nogopurawuboparej.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88892335a---7221222014.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcaca3b7250---fevaxarapegafuwitijapunek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=feasibility+study+in+software+engineering+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_off0000d080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 16484 bytes
SHA-256: 51401395d72c50e3af1f67a558c3326a01cbbf92a7edbb8f8a56ca1a8685deca
font_01_sfnt_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 11092 bytes
SHA-256: c0c6099020efc7093c0d41a92b1c68ad35d5bb52491689b58ebc10fe5255aeb3

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