Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8e54eafacdd07b…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 18:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9a7de428a95f6d2e2cda3c7cb43658e SHA-1: 08b23da9319bc44038d6405a41b0bc9911c21ba8 SHA-256: ab8e54eafacdd07b7ca9f89881d92fd8e782a968eaad98538cd2626831ede9d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a machine learning classifier and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised websites and disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dsfly.com/uploads/files/botas.pdf In PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c16a9e8863---43743396559.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/46965502145.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/mawigufudugiworelabepoj.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/vexofigupojiritigojuxev.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/pupizu.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/pevufiwerupisomon.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/rakate.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a5516be6225e8fde02d88899d2e15785/gabogagikabezewazepewi.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/fumogezojajafepepumikopon.pdfIn PDF document text
    • http://poliinc.com/upload/files/vusoveran.pdfIn PDF document text
    • http://levotst.com/uploads/files/79695985254.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/redof.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/38f17329c255944a475ffbf73fad250b/49177826499.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/vurivowopivudunuvodujogep.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/jatofomi.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/81694913070.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/ganidebof.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/95545237787.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/81247415142.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/wipasubuzexeta.pdfIn PDF document text
    • http://ustunongel.com/image/files/19103444787.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/javivanojuvepuve.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/24394476785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+save+an+excel+file+to+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_off0000c4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D9 16152 bytes
SHA-256: 6bce1d3845082f8c7210a46e56b824bd9b6656af4e0aa7b3ca32fcf03318eee1
font_01_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 10760 bytes
SHA-256: 5714d8d1b80c247cb35e10e03ad3753475fe5b36be38ad920333523103c159ff

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