Malicious PDF — malware analysis report

Static analysis result for SHA-256 5434de8bec95e2fc…

MALICIOUS

PDF

85.8 KB Created: 2021-07-07 23:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97c266bcf1ad1c18d346d11d17f30cd6 SHA-1: 0ea70f3c7a9f51711dea03965b3b12e84b3b6a83 SHA-256: 5434de8bec95e2fc8a5f05b261411689bc73f8f68281969ac5db25db9af14f9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or facilitate phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm indicate a likely attempt to redirect users to malicious sites, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3762f6e64f---xupugalotokabotop.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b2cc9086b---jifabij.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/8hunmu6bvnmkpg5jmk0cuvni2b/kejikutapabepuf.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/84810326071.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbd43e13f4---birejibigajib.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607691c4ac7c1---gibemona.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd10307bf0---pesidowasoku.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/731459fd83d273f81fa7f86a92f14e94/wevavosudawujisekibixut.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210531025255.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d205162b4f---73569171820.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607700af69785---35339333175.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1bb146b03---90671179734.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/90599026014.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/55393d48f7ea92102df38dd4c644de68/temalifum.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/54226525090.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098433b2e865---52686426157.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/17451518156.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/67fdaf998e21d2c0f91293e3442be66f/64332802170.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b774155b672---32101375509.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/dufunidileroboziwogume.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/xokevififelonuwidukefiw.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/9416485898.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6383a9403---85510695712.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c1c226056---37811729928.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/83679993156.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/83ca8721c5d05fb59e659928f40acd16/pozapikazujukawisirumesu.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/59948366470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=material+tipo+nPDF 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_off0000ea1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 19180 bytes
SHA-256: aa2f843df208b4418f42f30a0bc159a2577336a2aae531e94aeac1d4d4914a1c
font_01_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001320d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320D 10072 bytes
SHA-256: f7c5b6f8bc7c3f704f9d02c83869beb0c521d054269cc14ca600bca79e6e0efd

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