Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb24d9c009d49da…

MALICIOUS

PDF

84.3 KB Created: 2021-10-16 03:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 49d89b18b09564c8546336241b115597 SHA-1: 8e9020e0e158bfb703f35cb8972183a38dcbb940 SHA-256: 1eb24d9c009d49dad597d78050910771e2958c20ccba68d3b2ea9766b7ca451f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://tycoonmedical.com/userfiles/file/wawopemuberixiduxawedalef.pdf In PDF document text
    • http://gibisch.biz/files/files/36339556450.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161597c4879f6f---37912814727.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/baximimesu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161620593b03d2---92503261167.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/45181268234.pdfIn PDF document text
    • https://beautydent.hu/editor_up/gaxisuborelalew.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/josukisep.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/6783747406.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/92218469225.pdfIn PDF document text
    • http://bamila.vn/luutru/files/54684431621.pdfIn PDF document text
    • http://zenkatsu.dk/files/fotowiwibopi.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/55373931334.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/006d73fb7d95823434a13ce0d2aa9bbc/walupoboneseluzanag.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/14064801937.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/wonivekujesuwopikiz.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/lolagajezodadelogo.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/tikejod.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///91729982187.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/lenavob.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/4ce00ff4820f655da4a714031a497479/molevomonanagar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/cmwvf4RlXg4/uplcv?utm_term=smothered+cabbage+and+potatoesPDF 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_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 18300 bytes
SHA-256: 3babea4fba6a4d3196ac93ef6a41a8d6bf313ca51515b6f18d6337635e9af80b
font_02_sfnt_off00012af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF1 11036 bytes
SHA-256: 5be54540f62a79368f8394b88f50cf6ea63453c1efed361f2851167fb150b611