Malicious PDF — malware analysis report

Static analysis result for SHA-256 da161e1deccf7ed7…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 05:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5aa69effa82421d0379c4ee7256e1ad SHA-1: f73dc4137783da486be79929ebe0f274573e58ca SHA-256: da161e1deccf7ed726e036da8e153ac45c308b35ad297f725d7191e931cc1bc6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db140a35aa---36389577568.pdf In PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/68444196216.pdfIn PDF document text
    • https://yellowstonewildlife.com/99188599830.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/0943de14666a15c22bc0ab958336c1e6/jomagikitopepedum.pdfIn PDF document text
    • https://sapporopools.com/contents/files/72029781256.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/pizizudufado.pdfIn PDF document text
    • https://quizai.com/uploads/files/noxafudeleboduzubakuba.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/7315629745.pdfIn PDF document text
    • https://uudanbury.life/files/file/baxisunam.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/dutivofateriti.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/bufuwetobi.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/pinegof.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/85388348278.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/jixizopukiziwutado.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/pemabogu.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb359fdb6---34315829215.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/rawifofesavezamesemofuj.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/vemamasiworukoteveze.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/98579613981.pdfIn PDF document text
    • https://senegal4d.com/contents/files/gevivu.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/zolemigel.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ce188d799---bunakujilud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=robot+indian+movie+english+subtitlePDF 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_off0000b112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB112 10948 bytes
SHA-256: 55f0f0538f06be3c79089a4b25822c15f483c2207f75ab64dc7b2bb41bb64031
font_01_sfnt_off0000ca13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA13 16480 bytes
SHA-256: afa7be2dcd70dc9978b22ee7a78c84156654e895ba5c95f17db6e8c7bc0d6341
font_02_sfnt_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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