Malicious PDF — malware analysis report

Static analysis result for SHA-256 467fd891a20213d7…

MALICIOUS

PDF

71.0 KB Created: 2021-09-08 05:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 11d21b795324caca1422200ef1b7d861 SHA-1: e5bf6781e82ecc060aea2a38435cb6f317ccc1d7 SHA-256: 467fd891a20213d7f15cfdfe0943e97698869a6d5bfbaf74692ad598100b484e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely responsible for executing the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f570dbe7b9724810b0de0fdee6ec148d/55626641915.pdf In PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/56242144032.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/wupalulolizumene.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/futusoki.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/44359511925.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5ba3e4eb9c082ff79570eb06c61d167d/28833185769.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17dc18461b---35477598741.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/makekipopife.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e6212f81836e567f1f2346fb0b6e75b8/mawutezejubavavujujozuzo.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/worusulenapatixiba.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/81jqo32l0v3i4tibqob39d9s56/91651566466.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8052223953---xakoveme.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/gijawomeju.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2a54a870a3e9c6abe5665282ad85191/xewedenuw.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/wedulaxederolaxifavawudu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/cbd890b2f8821b3579cb61f4ebce2d9a/25402585493.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/41891031081.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/aafcf5689da3f1106890505a1625996d/79708428879.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/72761698013.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210627100827.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609cff4e983b9---vuxewetoba.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/cbvq76i69isje5rb1fd2aunmk0/rububukobalipedavorotazij.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090284496fc8---xifutorokubevuwevosebedo.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/qs8tavorl20k16i7cb55q22k47/lixadazuwitofon.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/27742572948.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ef5683e62---76029693725.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/xuxesezegesuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dcaa+audit+manual+unallowable+costsPDF 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_off0000b8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D8 10756 bytes
SHA-256: c8e00be6962b6418a29c536cef66c67ef72b755f935751c5b43e91150e9e1e1a
font_01_sfnt_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 14588 bytes
SHA-256: 652facddb6d4c3d5bf16236f8e1f0c5e393e938993ecde2eb6a00009ca626cbd

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