Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea268e987c0bfb99…

MALICIOUS

PDF

96.8 KB Created: 2021-09-20 23:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 233fc925cfddbf9c23f9c4ed41b179ce SHA-1: a5e1f457c3aa0956312a1d8b46e92f8cab91ca3d SHA-256: ea268e987c0bfb99254885ef422c5536f23ff83629aa0cbddea2f50b671c637b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, many pointing to potentially compromised or disposable hosting. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or malicious redirection schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://wisestudentz.com/userfiles/file/tukaduf.pdf In PDF document text
    • http://gleb777.com/fck_upload/file/93042733421.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/67594427967.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109090325259359.pdfIn PDF document text
    • http://agilesolutions.in/uploads/tovope.pdfIn PDF document text
    • http://thegioioto.store/upload/files/kuxomubujinafu.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/kutemizadonum.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/navepun.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/japarejekam.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///kafofixavesukapi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/1e790f024c00115d301d6a9cfb396da8/vitikulajojusu.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95767183009.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/14898788322.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/moxijibax.pdfIn PDF document text
    • http://indel.sk/userfiles/file/gilukumamurir.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/96791120617.pdfIn PDF document text
    • https://vpmemorial.net/images/file/burepujaxe.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/jubavusujagapod.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16148534ae6c0c---7225552327.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4d1d6a705936dd3b90f12cbe7a291a04/43400099063.pdfIn PDF document text
    • http://cpils.com/userfiles/file/nelusukowemozob.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed891d1a64---rilinesusim.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/migezeruropas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=minecraft+master+launcherPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 25972 bytes
SHA-256: fbc7cce35413ed213a46e75b20bec221256a286b5dbfd73e98127fea6a226389
font_01_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0B 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00014502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14502 16692 bytes
SHA-256: 73427592ec099265ebaa52c0def5b8a975d149b71195ce5513328f584667dc5a
font_04_sfnt_off00015cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDA 10576 bytes
SHA-256: be7a45fb9d29920e9708ee1d84c1edbcaca44d3a1aaae79a12a1ea93da011e90

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