Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74260b3acaf6ab6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 03:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e3452db0d281cb4d7e09a8f6c7d8547 SHA-1: f51b144db1c3ca0be4a5b444fabd5f39100e6ccb SHA-256: f74260b3acaf6ab69fe8292abf3dc8c038b0779fea5b981309ee57b728b8d079
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=how+to+block+notifications+from+chrome+on+android PDF link annotation
    • http://whkmradio.com/userfiles/file/15186814043.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/55870163667.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090219235873499.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161381c024dc04---73022698788.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/xuzowibokir.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aff3d290f5---pagolumi.pdfIn PDF document text
    • https://yellowstonewildlife.com/35131360558.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/toginolekosesela.pdfIn PDF document text
    • http://www.77ice.com/upload/files/gakufugesibadix.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/51873273839.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a279720de---wuvenimedakosajavamitadur.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/sojorebibejo.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/83074156016.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/71415306181.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/denavolaxugikari.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/88522058929.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/65752337325.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/jijumexagavax.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ef6b7d6f4---1695791354.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/xibokewe.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/67706843618.pdfIn PDF document text
    • http://creationart.hu/files/file/ladolinukusulaj.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/vopukinekifegexu.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_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 17936 bytes
SHA-256: 5344bd2d0c6d085e2b00ce03eeea22e7c25ee098775763f11bf6d5c10b93b604
font_01_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 11052 bytes
SHA-256: a5e89183f3714ec356c88b45eab5e37878aa58c9cea964ce568afdbc398e7764

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