Malicious PDF — malware analysis report

Static analysis result for SHA-256 2993a3150744426a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 10:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e54eb698fa0561bbf800952c4addeda5 SHA-1: 3ff8ead333e449a9a85b1bcffabb32d450ccb5ca SHA-256: 2993a3150744426ab4e38cf9fdf66f9c8b30580ad7c5fdc0efc4c3b308752b58
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://thefencedocumentary.com/adminfiles/file/juzulegatij.pdf In PDF document text
    • http://adec-interiors.net/Uploads/file/4483979118.pdfIn PDF document text
    • https://aokman-drive.com/d/files/79804012849.pdfIn PDF document text
    • http://shahgrp.com/uploads/mebekej.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/52384238573.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/vojekivigowojugakokajajo.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/35697756945.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/14578025347.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/roziduzewisibususugago.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4d4101643ccdf3afabd750b07efeb657/27708720852.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021070523595896.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/51ja0qshtu38koqs0bsnjjg0gj/xokavovewoxivijureturanog.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/bilubexijeralil.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae919f5d7bc---wewotuzafitoxilo.pdfIn PDF document text
    • https://biocoils.com/img/file/34231211308.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d9daa471---dikusupudaxigaru.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/dudujironezoditovuxat.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089683f1d3d1---maxilesi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72e80ad42e---59536349480.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/uuf3q9f1ifgn6ja2hbt6pnihih/63117875752.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/bexetipibiladateni.pdfIn PDF document text
    • https://ingmarcomantovani.it/file/96670875190.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b55af52bfbf---16535904538.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b435a88022e---25060281260.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/ruzopozagikisewibaruzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mean+median+mode+range+outlier+worksheetPDF 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_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 10964 bytes
SHA-256: 6f5a1a0c4c1533ce3e61b11003bcf7905bd2000e6ee12e7db614f14aa4bc2c8d
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 18392 bytes
SHA-256: 0f4b373385480b3ee4d371e18a69cdd87aa8d4a8b4d4c1f159538c515ec60d78
font_02_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1