Malicious PDF — malware analysis report

Static analysis result for SHA-256 543346991333d5e7…

MALICIOUS

PDF

87.3 KB Created: 2021-07-04 00:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e620a5a4dd23904175744d1adc8b7b9 SHA-1: 42154a6fe482f4499d3761b286dfdf34e4e9d595 SHA-256: 543346991333d5e7f32c595919b850549ad72ea36d6109c90d007971b1f9b1e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's used to distribute further malicious content. The PDF structure and numerous external links support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16098c4fe3e501---feruxuvopebiwera.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a6277158d2e38443e3825a8c03584089/muritesetemugujoribef.pdf
    • http://banghetretunhien.com/media/ftp/file/81681664619.pdf
    • http://nprofit.hk/userfiles/xuwovujowusikaguwus.pdf
    • http://newo.ru/files/files/61043065088.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8796b9ab120ed201eea93e3c42260bcc/2912919667.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a905f11c069---bolajugumi.pdf
    • http://lavalnerina.it/userfiles/file/69534528163.pdf
    • http://eventechsite.com/files/files/53866312575.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7dda8561e---20150654172.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a899290fc0---xejejowezo.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d736acbe5f---salezinit.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5940bbec6c---51874044014.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c22c03a0b79efe407ce15fdb91ed81a7/50534965849.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609019e668b59---sudurojulejerig.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/hmstj92bp1te073l5l7nbs0v12/95483919195.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe7ea973c7---87786845477.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/248a6ea0e722f53b973de71a092aead0/44223667263.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45b882a18---fivigefadoso.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8fa7e77e5bb5c72d3e357ec47f2563ab/labolijubimovenuruje.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/ac2cdc346961655e5ff03d03a72d6cb8/muzanoxibutudubizotuwa.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/bf2c66d84ec40c9f17f1054576e08d18/wakobigavojato.pdf
    • http://asiadomainstore.com/userfiles/file/wimigaduli.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b9ece29e7---73589835812.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=meaning+of+non+alphanumeric
    • 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_off0000eb90.bin
cf776dc3fbbde37b91d665b9e2e2e2fc318a1c5730094b5f6485ae91cb8dbd05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 19572 bytes
font_01_sfnt_off00011f4d.bin
8ea479fa44586280d83805a0e2f69d09fc5db55e47e00de9ef9dcbaa54d83ef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4D 10752 bytes
font_02_sfnt_off000137c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137C2 16792 bytes

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