Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5897114cd941f11…

MALICIOUS

PDF

78.3 KB Created: 2021-09-23 19:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4177763a9e950465d6fbf3f3a5f3afd SHA-1: 8a9a06792cb2e1117b61c208f610ecb56a4a97bb SHA-256: e5897114cd941f1152516e7428c1e5859fe16b1e07e86191380c7c3d55f49170
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://neoneofitou.com/ckfinder/userfiles/files/69670691557.pdf In PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/xubis.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/werad.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/72301927395.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/vamanalemovugopizib.pdfIn PDF document text
    • http://friulanapanini.com/images/file/12506443985.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/73064004597.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/fuzimujomexiluxitifubifum.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/bonapimokimagiv.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210918114336.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457590e9676---39960116355.pdfIn PDF document text
    • http://ssp.by/var/upload/54243116773.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/53812689417.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/tumudenaruvatorakiladoba.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9b8fde08f8e8804ae7afab530ec67078/46765693429.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/reputetopunojefoxud.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd63aa44aa---nuzajoratidufuwefak.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/76958070016.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a981d2fa9---leratidanumesoruvipime.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/vudazokazuxafagaluvaz.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/38420411105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=free+comic+strip+makerPDF 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_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 10456 bytes
SHA-256: 882116023c24b2e0c5908afe8bba23300d26b17cec47becfdc8375d60a109d03
font_01_sfnt_off0000e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 17652 bytes
SHA-256: 8daf328b77c180c369dfcf7e80bc6e723a580ac53b6fb03d5f709b351c675a7e