Malicious PDF — malware analysis report

Static analysis result for SHA-256 718ee9ec18fda647…

MALICIOUS

PDF

94.0 KB Created: 2021-08-18 13:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e51b05782eecf4475fe24a05f8c5a4c SHA-1: 59721bf3e5dac55bb32fc52a26cec9d46bce31eb SHA-256: 718ee9ec18fda647d3ffb7e30d0193ed8f780337d274bda45440d23c47c4397e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of multiple external URIs pointing to compromised CMS upload storage and disposable hosting, identified as a link farm, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/cde8d44087626642cc50bdc4a6f17164/50409255521.pdf In PDF document text
    • https://sgotomotiv.org/upload/files/65487787060.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a4a8042fd---19202754318.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0d88e9d82---gomopebamavabema.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/zenujozejamapovusik.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/67569633561.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/vbsgcgj72m4c4oueg45gd033el/32906537427.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95f983d329---fopomaduba.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/baxozolamigax.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/65094591100.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/89758762306.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/bizas.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098be4a7ab0c---29156518877.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/tegimuxejixodele.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/xuxikilupabijaruv.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/pamunisoxakesirevorod.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/jarufozoxonukepeb.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/2211581274.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db03ee2ae1bef227afe4f938091f6199/ramitujupufuwimimaku.pdfIn PDF document text
    • https://kristinanamaste.eu/files/rigulitajeredafuberaruno.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/tugizezomowupidizujek.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161084fb687b63---25723152926.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e2464bf5c---94112147754.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7c791fbd---82414476639.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99c34a15b---veniramipitaxetekikagem.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/dddf87035eaaa38a53fe2336d907915a/saxoriw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+play+battle+of+the+sexesPDF 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_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 17780 bytes
SHA-256: 5163282d1568988f4bc3a4aea7e03f50243f4a085bf6f82a5208a7685b3df4ca
font_02_sfnt_off0001514e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514E 10832 bytes
SHA-256: e4af52f85d54206565410b941db9259387db62f89cfaaef7dac86dde53192159