Malicious PDF — malware analysis report

Static analysis result for SHA-256 774b172d7e81f791…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 22:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ded58adf5304596b778455b7610c6bb SHA-1: 87ca0247482fcdb75e69e56ddf6d2efebd726fef SHA-256: 774b172d7e81f791690323cc01f94bfebb6e5edafeeb05ff099c39b9f25ee289
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. These links likely serve to redirect the user to a second-stage payload or phishing page, making the initial PDF a delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/sisizukuwa.pdf In PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b962292b6---vavifebigixesonebidunene.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/83967932649.pdfIn PDF document text
    • http://asustainable.com/global/file/bemovepido.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/51933190971.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f207b2b087766312fb7cab6ac6196cb0/92769764126.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/zimuki.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b24f90de497---78128552044.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/85446190854.pdfIn PDF document text
    • http://unseretochter.ch/images/file/22218001454.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/12414403801.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-1/20210601054111247008.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qv83o8ecoqaekbpibnimtegofm/dolew.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/67484541424.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/puromidatowode.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/vurefibogepisewomobal.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ttl2mte7vk1kkeg5gltgltifqk/vulekegep.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///widiwomixazafejosuw.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c543f51d6e0---24091389105.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/buviduvizikafusebuf.pdfIn PDF document text
    • http://quaint-house.com/datafakidaginozupodo.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/gapopapanelivavolopebab.pdfIn PDF document text
    • http://ativn.com/upload/file/moketofuwipedujakibumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pashto+poetry+in+english+wordsPDF 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_off0000c372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC372 16984 bytes
SHA-256: 554198843c24a8ed7f4e89cada94850a03bebdc20886334a0ce0d1e5b4c07df3
font_01_sfnt_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 10872 bytes
SHA-256: 58720ccb5fe553f5550de904ec6526833f8f24b8aab8cff3002e3bdc4c5a221a

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