Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86d0234bc40b1b2…

MALICIOUS

PDF

98.4 KB Created: 2021-09-18 03:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1c1e1e153adc42d9983f64a8de9978a SHA-1: e99e1e64129e7e75315eb128ed28cd594b3675b8 SHA-256: d86d0234bc40b1b20ac3aab9d36825978e3ef1ddecc25f07f21f2da69d1c0cee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. Although no scripts were extracted, the presence of numerous URLs, some of which are hosted on potentially compromised or disposable domains, suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://10kshot.com/customerinterview/ckfinder/userfiles/files/renirufowobejetinitob.pdf In PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139865b22b38---22798636283.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/9667958718.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/48769863280.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/64418694375.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/sasusupupivazenuzepi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161375c09b2a2c---8612077521.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba9dd4c33---63155217366.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/21733036862.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/kezijajofag.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/perizurosiduret.pdfIn PDF document text
    • https://mihalex.by/files/files/vogogadufugamuziso.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/92347896713.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/kefanofunonogijo.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/50937465972.pdfIn PDF document text
    • http://popmetre.com/news/files/22947865500.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/42647161003.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/lexofidivipuri.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/sasugufufebaxupu.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/38194126676.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/33717304518.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/57890664638.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/85291575386.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/vapaxodudu.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/zujunanutigozijazavite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=gta+san+andreas+android+60fpsPDF 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_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 10776 bytes
SHA-256: 013159a4a11017e4b5215cf11f4cd21aa137a14befa8ca37117fd20639b392a4
font_01_sfnt_off00013260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13260 18772 bytes
SHA-256: d99dd406b8bf441596b5827953395776572a92ebe9d87babde53e711d9743bfc
font_02_sfnt_off00016399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1