Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4bc4bd4494e8d7…

MALICIOUS

PDF

91.4 KB Created: 2021-08-14 18:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ed7b5963177de2f4aebe4ad95364418 SHA-1: ccc7912e35beb146d86d6c788e3706f2b007f833 SHA-256: bb4bc4bd4494e8d783fe558e9fc30dc2534cedb47c7d8c5b9d1a919c34ea3161
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm indicators strongly points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c13217dc2a---79185212113.pdf In PDF document text
    • http://vina2002.com/uploads/files/bugobemusirofegivodit.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607277a3bc2a7---navotezezekigepexada.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740100dac3c---soruliresivotigutojexurul.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2017bda2---28866854751.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f1051e9b---fewizop.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/44536472821.pdfIn PDF document text
    • http://labradory.pl/file/mowetedatefimetuvubit.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a73e1979e6e8c811730307327b3343af/kikekivugumexalepoj.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/98708690497.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/todatemofabozi.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ea732df15e334888317bfaa6355f0381/kudujatodepisiwezizutak.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096076d2e599---kijodugibexed.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/91319767489.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/10937443904.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///74271680858.pdfIn PDF document text
    • http://beateromer.com/bilder/file/sesaxit.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/746776072.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/91532975022.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/fogadinegagal.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd4c77cf93---81082179921.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/oge4oalt63iu6icsbadkaolv37/lolululenezibiganit.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7125a01d4---rolasupifatasokakasomej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=problemas+resueltos+de+funciones+lineales+y+sus+graficasPDF 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_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 11176 bytes
SHA-256: 7c1e99c48fc97b70055ed466d3870625bfd718867873c2eaad2a460c3e424939
font_01_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C39 18824 bytes
SHA-256: 81d94b88c762227a5bffdadc71d144d84af579d611d1bcdebf4f39c0c35be362