Malicious PDF — malware analysis report

Static analysis result for SHA-256 16974a651eb082e6…

MALICIOUS

PDF

77.9 KB Created: 2021-06-24 14:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c2470d01f21ada967860da87df2bc54f SHA-1: 44210eece83ab0090550d37449307303499e6cf2 SHA-256: 16974a651eb082e631f7f7c705bff615920d6627fe3364ac5dc7727fd4b2472d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://arohitourandtravels.com/userfiles/file/winorumu.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/30e852673f4c64e20c5d574d22e7e6bb/41362793824.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b8f06ad77cc1f09c1fc4a3d0644f38bb/vajebajetesatoziwekeju.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1ce72d0284e001a9117c69f52c2b88fc/87300570249.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3er9h7rr8utu4mjvpcnhbdgtv3/53716716220.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090348110577---sevegulemazejobuw.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c698b8c1cb---xinajo.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/4508ebc9b724d995ed0ad8dbac749a70/ropavuninobumos.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/fd50a01f4b4f4294e69ab90b1ea7c9b7/25445412533.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609858d60f799---94219870656.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/katodadepotomenega.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/95296296273.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210524155106.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/85021128441.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/zolagofajavaxo.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/75649895023.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8871aebc---39336732684.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/sotakorakatuwozot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=frp+bypass+apk+android+8PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 5376 bytes
SHA-256: d06b7fbcf7d30adc96bf456a3c80012d73420e81209f958a1c115c2ad7a01e0d
font_01_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 17620 bytes
SHA-256: 38f007bb7c51bbeb2214a358779861cc1d234298f5e641c8f82a2ef29523c2d6