Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee36f4d2d194e27c…

MALICIOUS

PDF

79.9 KB Created: 2021-08-30 14:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ad18374fcd435b44b166e0c11f23860c SHA-1: cf6f5dbafd1531de5d74769a5ecc010cac1954fa SHA-256: ee36f4d2d194e27cd7fe24341fb52e1fb05ece8f78e292238ec50b207df599ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://fenicia.uy/fenicia.com.uy/uploads/files/7327111484.pdf In PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/novoxawazop.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/watetapapulovezafizadu.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/97314833069.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/3ejpo6rnlbq42n0bq8is88hgi0/takusegusumazu.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7df8d7fca73144ef9d57657a3039d819/77428805852.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607de017b99b0---fewodejajovegixebade.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8b3ad99088a046a6c00d49051a970341/vabelivezanozin.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/mojupametuvaxu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/2e4b634af088168c09cfecf1db4966ab/zexuguzojetujesezejuxirek.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/28947168644.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/nilunugulevukexirobo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610529dd3fe01---sarurapefela.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/dekikif.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/vilejok.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/9884152480.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/buduwakobivaviwaxevar.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/94609950175.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/3faa8762ad341abb0f64ce958324958d/wejamekadomuzula.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa28d86147---49988071030.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b5256a9b503---22882628958.pdfIn PDF document text
    • https://yuktogel.com/contents//files/bezenifadejakomefu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jq5etov04rf5v64a0pil6qckm5/lunubavafixugosanerigog.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ae7d67884---bigajilenumalipixibile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tractor+instrument+clusterPDF 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_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 16172 bytes
SHA-256: 247b1a9fd2826d69dd3eb8f522587e9b90f0d8a7fd067c46c43565ee34ee46c9
font_01_sfnt_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 10452 bytes
SHA-256: 4ffb3daa89ec63e85bcbe3a50c34f25b2251b7083e60a0d44265465634e430b9