Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64d6c0b70dcfdec…

MALICIOUS

PDF

67.8 KB Created: 2021-10-03 04:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30ecd00dba7776576ecc3c8d67d0748d SHA-1: 3046a26fa521d3a6e1ade23c3297f89763d31273 SHA-256: b64d6c0b70dcfdeca1aafa4d8089819e6e6fddcda3c1a1f8509da07521e4757b
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially malicious PDF files suggests an attempt to distribute further malware or engage in SEO poisoning. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://altsovmun.ru/userfiles/file/4180114129.pdf In PDF document text
    • http://inciboya.com/resimler/site/files/vukomaratanuxumutikok.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150253a429f8---17913690148.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed729bc4e---jumakarep.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/90196216278.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c25447f56---vojuvibigitinilemoxogani.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/jizenimuvewudujeva.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b9bea5beade6e514023b384628bd23c0/sigidipi.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/54562745645.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/4133459600.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161337fc331a31---patow.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202108312014244381.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/89387220243.pdfIn PDF document text
    • https://tmtteks.com/files/30329062378.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5ba4c8c1fdf71b86af00ec31ddb75982/kowobegi.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/54959191809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cranberry+juice+and+blood+clotsPDF 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_off0000a745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000bf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF57 16788 bytes
SHA-256: f54cc6dbf43e9191dfccead07add19d4d180567e30066e8a053078f35fa0ec1a
font_02_sfnt_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 10880 bytes
SHA-256: 85369a2542f8f3b13cc14d907232ff4eb37ee85e6e04759d184eaa0a15e85818

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