Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e73dd39a0e21b9…

MALICIOUS

PDF

105.0 KB Created: 2021-06-26 07:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bed5f7bbf34589c109a056415361b416 SHA-1: 11902268e567eeff9fd60759f6ff352f54f097b8 SHA-256: 18e73dd39a0e21b9e2fa8eb921d9207b916fa389d5f9a4639d160e7bf929d3fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or credential harvesting attack, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b221bdb58a6---97954122892.pdf In PDF document text
    • http://dyglas.com/userData/board/file/14858837945.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/115e2ec57eb0add407f723b3487eae65/figuv.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/rukaguwijewetomugejatuta.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859cb5f0916---84680744503.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce00dc7a4a---bafowovejugitilosegiso.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/25412152222.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075af6c4bde9---zizafun.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b93c828348af2cb49f7b9f9ddba14a71/62700447092.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210625014936.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096385fe45cd---24248907070.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2a684hs7g3b7ovgl6iptavuqhu/97092283293.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b52ba54fd763ffe9ad5ac979d11f8b7f/vudenolitovisusozogifo.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/72146974312.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cbhs835nh5u30nijrmh0oj18u5/28887482713.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/52404726812.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/jolazuzawoteto.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ce3ff69c63617683ff5f4a3b6a689917/69437437689.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86dcc28a2---24855978086.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/17132344601.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec42b1b57---jemenilodujukemeriru.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d94921a2e2fbfcfab9b95d2d59ab80b5/63568814938.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94fa78eeb---6237564814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vamos+meaning+in+englishPDF 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_002_off00010dc1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10DC1 19268 bytes
SHA-256: fe4de060283d44f909c2bede8ad6eb767999b8033f29aad31eeac2902558fafd
font_01_sfnt_off00012dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E0 10324 bytes
SHA-256: c0a168b742454e16b5e81c844c570fb7df2ee76604ea91789cd80d0b00b41c2c
font_03_sfnt_off00015cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEF 22888 bytes
SHA-256: 6ee8906cdb2acc819374658f2dd59cb26baa6c057bd9aaff1cab9a2098a45f6c

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