Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea8e99236eb8848…

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 16:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98feb7153b4f82dc807ed75451796c29 SHA-1: 3d3d3357c64bfe5bb0ca8db12f0afb908265d267 SHA-256: 4ea8e99236eb88485a998124cf359cf384c7be9ea03ee3585f581ddb082c82d1
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while some are marked benign, contribute to the overall pattern of redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://presssimayeshahr.ir/pic/file/pexelupixiziropixuv.pdf In PDF document text
    • http://texinpack.com/uploadfile/file///2021090223060272.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed38f3e56a---28033840871.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161312208e049e---3636561871.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a5877fd640f632d562fb0ceef4068725/mufabazavixavenepenog.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e03dda28ab8efd4e1d563b7e11bf2a93/63592592208.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/xepumowewa.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/xuxulafefelaroz.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/32557765910.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/niwuxidemelod.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/4643782979.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/39245490465.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/97740823946.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d35f352ba7a85bd3595ab8aeae35d2b5/tulinedona.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/703e2cc493e943fe02930e3467c538be/gomiseka.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/tijupovusetiwitulanorejil.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/33446716359.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/jowijojuzitilejasexiveke.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613568500f6ad---96519111394.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1362279181613ea126b0d32.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/16135967664.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/50285337926.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161324895d63ae---xometoxiwutowupujena.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/53352810123.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/pixubonujonomejum.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/38146671345.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/92912577302.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/figugedojurobamigawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+recover+texts+on+androidPDF 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_off0000c435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC435 17520 bytes
SHA-256: 003b5504b72a8a9a2d09b6270cacd11b87a39f20c8382f46f40cb21925648376
font_01_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 10564 bytes
SHA-256: 9398345154d61126461bcfcfaea71063a96fa81deca3bd3cb341bda98ad2acf2
font_02_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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