Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ca3ec706b3b246…

MALICIOUS

PDF

78.3 KB Created: 2021-08-31 20:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0163251adfe0b83a2f24e05a1f2be08d SHA-1: d8a7f4bbb53792a96a2494bdf274262ec0e59418 SHA-256: 72ca3ec706b3b24644c4b7270c28578d058b2b3e3400b643a2ce075b577f886f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://akcjonariusz.com/UserFiles/file/77301287736.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e42b5634c---57696493913.pdfIn PDF document text
    • http://myphamasia.net/upload/files/28617347180.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/29094624088.pdfIn PDF document text
    • http://proxima-design.cz/files/file/62018243408.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607176657ba77---76915530128.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9436415a7---bokarenilofunobefe.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ffaf0fd6c---fifixewoluwafutazafaf.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/nuvevumaruzano.pdfIn PDF document text
    • http://krupongs.com/images/file/desobivuxojubaje.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/79375113733.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/nc0boo59rkijol8ita4lkbhh8b/kujipobarodiliguxizaw.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca7e08d268---nenubekozodemefijituwipik.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160869e9e99869---jikefegoji.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c423593a04---18135754027.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/dadutesuriki.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/08daed7f7ff8057c4d1ac133e2236ed9/murepewojozipe.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/nimakixunax.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/30840920448.pdfIn PDF document text
    • http://yuha.be/_files/file/zoxapodogomuvutovesetotex.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/tozuwisoje.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/705fd2122dbc47719760ede26292d178/gowuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fundamentals+of+differential+equations+9th+edition+pdf+free+downloadPDF 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_off0000cbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 17520 bytes
SHA-256: 237286d41b419a2fe2c0bb234ba0db1f5ca03f0dad4206aa1c6b02f6cfa02ff2
font_02_sfnt_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 11240 bytes
SHA-256: baaf1c0d6b83585d0ad2ddebf8606c77b6560a44ef45a01668fcd5d2cff1cc3d

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