Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef57d8637a065ad…

MALICIOUS

PDF

77.9 KB Created: 2021-08-27 10:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01d7c1899ba6b5df2492d6646a74e66b SHA-1: 47fe15d3872a02819549cb6ff7b1bd6869b75eb5 SHA-256: 7ef57d8637a065ad1ccb5766cd8a817fae8340e3cd8873d9f04067ae60676d6d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are identified as compromised CMS uploads or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm strategy to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://aldo-ins.com/userfiles/file/ruvurafiwasaxujuxilil.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e7438e7868167d9a1addc77a347c0bfa/sopedodi.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/13282474458.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/59379193123.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210529081009.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7d414ec4c1d56cd2c15e2cfb22486838/xamina.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/37586143057.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/88326484497.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e65ee31d3---nazarufasavikiromaduvigax.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/noxilovikavuturo.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/kufajogemalarelafifulonir.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/23043323757.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ece629c9918d194d66515db33abc643a/lexemetetavijuladajokisi.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///62773340510.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609090ce1528d---66002712790.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f62e73cbaf---30738143217.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/18483135586.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607131b7c8d06---bubapogujumibinutekiran.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/nuguvitivezizagapisido.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/lncrpjqmtfeecg4pgbmoiuep8k/19386250031.pdfIn PDF document text
    • https://kenadong.com/contents/files/zemodizax.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/xasosudiji.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26a2e2cebb---10423178159.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/35449528166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wind+instrument+starting+with+oPDF 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_off0000cca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA4 10828 bytes
SHA-256: 9c83f096ac728e0e27334d75a836b0790c8253d02cc50854995e4901b23a48c1
font_01_sfnt_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 17052 bytes
SHA-256: df6e6afd6b44e1292838423c35626a791e9f85be8cf9b345917c3fbe6704c865
font_02_sfnt_off0001113c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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