Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac82e1a99b7c766…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 01:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8c21227698de42eef50ae0cc15649c4 SHA-1: 9b0d3931389633c258bec20b13ad16e61600370f SHA-256: 4ac82e1a99b7c766809cc8ea7a0381038b4f9d9745118dd76a71eed75468c4d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and link farms, suggesting it's designed to redirect users to malicious content, likely for phishing or further malware delivery. The presence of multiple PDF-specific heuristics related to link farms and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=just+in+time+logistics+pdf PDF link annotation
    • http://52fotki.ru/ckfinder/userfiles/files/zilonoxizupijosif.pdfIn PDF document text
    • https://cecprint.com/images/file/nukam.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd730692302---xamulagi.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7b85b7d15---sawijokexafon.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/kibumewunimidorivudunuzu.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/radizudox.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/238d1ot6idjfp7td36p70ralgs/21960204683.pdfIn PDF document text
    • https://buyafranchise.org/files/files/gomerevikurifixefidixep.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/pizaxiviwupoguzazuj.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/82098525029.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/metotuwagolig.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/3c596e8140250cee6d892608c219d4a5/93488293240.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/69283295335.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/aflbth9aao5ph5c2a1l6nnjuom/gonofu.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/joluxigiwige.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/xaganoxaridezexak.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ba5c5db1eb162794d86275c01d3cf192/51717795748.pdfIn PDF document text
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/fojas.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/wajodiguvokomeguvulumun.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2461b7ac6a---soponepeluvabola.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/18166398978.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075be7934643---fanigutalilojeribenefitu.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_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 17496 bytes
SHA-256: 85e5ec021e0aeb182af6fd40c05dce7836a64e1f949238d3868e849623660295
font_01_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 10792 bytes
SHA-256: f33468f897f64a0b9c8d4a2bde0bae373273cf437d8c54483983b14e73a91b15
font_02_sfnt_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1