Malicious PDF — malware analysis report

Static analysis result for SHA-256 151590ada221adf7…

MALICIOUS

PDF

84.9 KB Created: 2021-07-20 05:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d428dbf4d5d28f3d0f149b3a352a0477 SHA-1: 02873776dce1c5b2c4fd70a594ab048bb70db612 SHA-256: 151590ada221adf751cd59e8fd6de8a6ead37d46fec0e36a0ec868d9aed36059
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains a link farm pointing to multiple disposable hosting sites, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on compromised CMS upload storage and disposable hosting reinforces the nature of this file as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aqbnb.com/uploadfile/file/panuno.pdf In PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b714b77ecef9a04ae3da5cb66a00968c/88068295805.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/150402226.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bv2c36ccatl8a6e58ojovj5sg0/jupulejukepuxivebe.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/71496667079.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/38b026f9f7f6d612b375c5c8e2cac720/65920219420.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/rabufova.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/80577135976.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/78880654929.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/bufovafifijigasilibipuni.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096d4001e14e---10058583005.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/78526007680.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771cca55e56---welavubebegezazalotugo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/35e2b456180b05d58aacf53e04f714bf/80765413912.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b906f970---42651813046.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/23204630383.pdfIn PDF document text
    • http://stonebreaker.at/vutuwejosibi.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ddrs9jrhprl6560egfisosoc3o/17926765711.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606e99efacad0---33807385228.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/dufejugagojedufawu.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/nodesazebike.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b740b47397---381780777.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/rsinaetvfj1gf1m7jvm6v8fjk0/lejekefow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=moving+chairs+on+the+titanicPDF 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_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 10520 bytes
SHA-256: 9b5d1e8a6a6ee63762bc8113efcfcb2cdb1e1e32995afeab7b6a4bae632e4836
font_01_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 17376 bytes
SHA-256: 3562f4a2a145b44126c8f197c39a458f5e0c95e5b331f5aee7e3d25b8bab22de

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