Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b86aa7e10a2b03…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 14:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 008e21251e725d5855158246a2a302a8 SHA-1: bdbfeedb5b7986400bff51320edf80631a372bba SHA-256: a8b86aa7e10a2b030713fd6129560fa5f7fa4d0325ed3674e1d8fa66eb8c06a4
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware or facilitate phishing. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=amazing+grace+my+chains+are+gone+satb+pdf PDF link annotation
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/dd789c83dc2796f37ba0115fb750386b/75623493854.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1d5k0k34koqjmilg8d8gp6b977/9554095335.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74d57991f---46963789071.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/36601609459.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29b959a7a1---14889253992.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/lazamag.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/dafenesedo.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/dexiranozipubujedumadi.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4fa7e5a07---tudedilarojex.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/duwife.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/famutadowabukega.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fdf1b17bb---48630783244.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/v3l7j2g5togthiu2i9d9u75gti/laputitipi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4c1d14c821103e116757b5acb3c5e0d2/ravapajo.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/popiwemidexazikixerafo.pdfIn PDF document text
    • https://apra.pl/files/file/3004437703.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/ziwapotojapebibofax.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/41737739531.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/26c141ad3583b0a1fb63f3dddf0d7e9f/91712270337.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16104e42d39c30---86699448438.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a309c2335d---zanuroxizul.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40f98ea14a---jikufetewupexabarakab.pdfIn PDF document text
    • 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_off0000b8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F5 11316 bytes
SHA-256: b827e6536c9630ad2d9f121e4055d02916d38eed6a4d24407fcd27347273bd7a
font_01_sfnt_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 17036 bytes
SHA-256: 7cd261f64f794bd67611e66c3651468a182c654be60ee50b6e16b6fcbce99061
font_02_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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