Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b9c8e39979a6cf…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 22:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81816cca660865122fcb36b4607c780e SHA-1: 432881ce256aaa46b64ed662dbfdeaaaadee3cc6 SHA-256: 14b9c8e39979a6cf5d891449b990e6c50960c12ef1743d778d2bdaf504dd8860
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm designed to lure victims. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of these links suggests an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614047f877beb---nunisuf.pdf In PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/12343565230.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/2b9559ad957680691fa9820c00e80417/94024294476.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/zivakobiwo.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/talekusesugibotifonedofav.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/vetepudegugibuda.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/60760539325.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/57560843788.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/96788548990.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/najadimipotolikubazafizev.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/fcad1cd0a4b4c171275929a07ab6efb6/61065969653.pdfIn PDF document text
    • http://altinay-law.com/images/file/busofuluje.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/napubimutafuxojexowu.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/xopopebafebobizubixo.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/57520240530.pdfIn PDF document text
    • http://mrybalko.ru/files/xujek.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/66b65e5b89f8feeaeaa97fd6c2df51fd/50645830174.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161404e49d38d7---tomebatuzuxiriladefa.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/puluzojijekumas.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/55411887795.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab321c843---niropufirojaz.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4f3237a9b48953606319c5d61044dd9b/kuwimomorijufafaduti.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/13688153253.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/fotesupedefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kitty+love+my+fluffy+pet+mod+apkPDF 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_off0000c3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A8 10648 bytes
SHA-256: f509f51acfec508d4872ba2208bad5487289dc5c8ec070276902cb297e77963d
font_01_sfnt_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 21972 bytes
SHA-256: 0287996106fed2de55ab7546a71981411fb01c5e13ae413ce0d9ced2bc98b010