Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56b88681e2fd3bd…

MALICIOUS

PDF

101.5 KB Created: 2021-08-26 07:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa9ab656f32359b46990f9942f6f3e19 SHA-1: c6308964ee214566c76a451edd49c4db3155720f SHA-256: b56b88681e2fd3bd7643d1a3b2f04576fff75ad5f92bfa1b92e8c074322f749e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The primary goal appears to be redirecting users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://namhunglogistic.vn/site/files/wibix.pdf In PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16107de7340a84---vebewopavilogegi.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ba0415fc23c2c56f9e49a244e4508f8/nevovapizalorol.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/todunafexulax.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/34124718867.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/judibukuwutulivunawewedo.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/38371713065.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3fbc6f1fae1d7bd6ed67f2d0085a3e65/bunufibisopuwimexesoweke.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/dekopu.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609670a76f962---21577580301.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/wumigutis.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/fijibezutibunenip.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2da298c92---1491382149.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/0tuqp48do95homr24tk2iefh5h/jinebejig.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/61175921686.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/90598048882.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b01a3100d2e---72253099365.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/n4d73q1oc3ohf6e16n6qgvj4ea/fubenulaminogija.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/91613602865.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d177f64fa3---32204291942.pdfIn PDF document text
    • http://vo23.ru/upload/file/28444897357.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c29e4226b7d---liravosare.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/manexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=direct+indirect+exercise+with+answersPDF 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
font_00_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 17680 bytes
SHA-256: 31e130766a170b30876de8af46dcc08441f51800c93859506ce7d937de580214
font_01_sfnt_off00013541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13541 10488 bytes
SHA-256: c1a7ab4514c74391260f4b57c78ff25478a4609f4d505d68ca2dbdf513abc7b1
font_02_sfnt_off00014d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D20 20756 bytes
SHA-256: 5931bf2b7a55c9032c54eefde5c0f665f0ef376faeea6ae41133b070497de980
font_03_sfnt_off00016f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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