Malicious PDF — malware analysis report

Static analysis result for SHA-256 702e2bfeb1ae8c10…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 23:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4502984ed0d7a2024dcebb9dd50e204e SHA-1: 7c5dce1373dda229cd98a9de54e65b0b6fcd1ccf SHA-256: 702e2bfeb1ae8c1066564a49378fc54fd3eadd7a3714797398b5a565cc9827d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chaodontuonglai.vn/uploads/ck_upload/files/94532418488.pdf In PDF document text
    • http://driscollandgibson.com/images/edit_images/file/duwibunujis.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/36257022144.pdfIn PDF document text
    • http://potlista.com/file/files/siwugobavenukiruf.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/71779e82dcbffc1a59c0df62b64cbcd0/32514412797.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/7e7a10c24db6ba90391fdb0f7adf08de/banununujaw.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/bawitosidolixuxoxo.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/19cf281a0c1b2afeb7563dec06d09c0f/darosapubevulavoxalo.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/52799648113.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/35e8c5e304edd918d74fa1b4801c93cf/pafujonosapulifozadovof.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/eb563665bc56b3649e5a4cb279a69413/biwufisogesoraluxabebenej.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891dd7cd6d6---25407644586.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/25b6bf5de9ecad4fe08b0e3d593ad2c3/49067454663.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/jarad.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aad533cbd0b---mimis.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/gobizixitomotapewer.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/tmnegjchpq4v0193o8qsc64ls4/topegevopuwiruzabowojiku.pdfIn PDF document text
    • http://shophouse.info/images/files/75056685665.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/pepolezimutuvosotito.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/xaforiwosazubuzavalojo.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/59682525853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=vlsi+interview+questions+pdfPDF 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_off0000cfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 16704 bytes
SHA-256: f099a6010d884509ebc92696c7f9fba7f7f9b7e91927c21c48b1ded53d331330
font_02_sfnt_off0001131b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131B 10696 bytes
SHA-256: 4c198a6b63690eec3a429baea6bad954199dcd01e53975a945d48266cb69ede4

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