Malicious PDF — malware analysis report

Static analysis result for SHA-256 76160224543d5293…

MALICIOUS

PDF

87.4 KB Created: 2021-09-04 04:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c9e2ec4ff2f414a331122b223d5969e SHA-1: bd863bc27bf85306ac96514c4aa2988f971cd4d3 SHA-256: 76160224543d5293ee81b78726aa8390daff18e280bd39c84b8053dace5a0312
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to external resources, potentially for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=the+greatest+salesman+in+the+world+full+book+pdf PDF link annotation
    • http://markone-tools.com/upload/files/gabosiwananesisupetireru.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/lurefaxuramosaremuto.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vlnednoaipgshhqovn46qh3qo7/tuwevupigabizudopuwokine.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/razubegunipajerokufela.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/41f575curh82dmc95n42d7nq15/nenolariropemazenovetel.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da03bf28d5c---52009208773.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160840981bd43d---birolimudibezotilebuda.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd77729baa---15465314452.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/faa1e55abafcc05747e1ddbc2100ff54/wosuxarurisozapasoluno.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/linogovoxonabigotiv.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/jebinezulomebubiworivib.pdfIn PDF document text
    • http://altus.pl/userfiles/file/72716954207.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/lizevavez.pdfIn PDF document text
    • https://vientangluc.com/upload/files/wiwulow.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/lokiga.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/kulug.pdfIn PDF document text
    • https://ksboutlet.com/file/files/23699365606.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3be4b1c9ddd9412dcc5a51a26896b6eb/16073513281.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/21805730409.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee37b7bb9ac---bufedusamal.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/49487559965.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160dc88553cea6---91604703610.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3155b79037---39730073057.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/xozawezeferupotufazetif.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_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 11328 bytes
SHA-256: 83d1c0addf16fb32ae5f7e36ef24750ca9ece898f3bd98c8f55c67c8c24d6a07
font_01_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 18932 bytes
SHA-256: b6c5dd4e9e93283140dcf5b5b52614df7e588c5595fe5b825aa4243c1306ec66
font_02_sfnt_off00013720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1