Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea13cfdfb321e4a…

MALICIOUS

PDF

107.1 KB Created: 2021-07-06 23:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ace100fee00aff049e8ac6b1692a020e SHA-1: 606ea71057dad5bac03b73c9b3b22d82ee8675dc SHA-256: 9ea13cfdfb321e4a79ef9a6612afa7cabf886560630ab1d02d5ea19603860c78
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs point to a malicious link farm designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://stroisvias.ru/userfiles/file/7204145226.pdf In PDF document text
    • https://lotteppta.com/beta/assets/file/41160809632.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/30584565754.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/210m4cg1tdvqqf92cvng19l5i0/80983835853.pdfIn PDF document text
    • http://gerocuki.hu/user/file/pepobe.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/59209155703.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/17553074465.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/16669741649.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607774b8cbe4c---26413857971.pdfIn PDF document text
    • http://17njl.com/userfiles/files/36074210557.pdfIn PDF document text
    • https://kede.org/userfiles/file/12409447663.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed7a686511---rorobagozes.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc034be69e---seguzuzinivov.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/gh40om7vtihlljjpdquufqe32r/rarorevabufazixor.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1916630340.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb15e0e8cf---zivejefurajezu.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/9651e134e583245b4cd72ab3690fb931/73827215102.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160afb3b28c89c---likufuvajelupifos.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/f6b0a9618721c7d491c84337bb62b29b/28277302460.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5pse4gg8mvdhkbl30pbh6bo1l2/radawowosidu.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/79258772753.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/bcf64c053f33bc8e05f6376c8f7e6774/8496526052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dua+for+very+ill+personPDF 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_005_off00016793.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16793 29448 bytes
SHA-256: ca4d5cd095fc9e02f3eb8122d6f285e6443ab39a50109be732573d9d2336a95a
font_00_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 18644 bytes
SHA-256: 49df76953725b43d39e92923e3967f27ddeaaee9ba82a5cf084682e5f4f097be
font_01_sfnt_off0001375e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375E 10536 bytes
SHA-256: 596469d54b2cd201cb4495c1de35925243455db34bd161f91d4dd20089ef4f20
font_02_sfnt_off00014f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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