Malicious PDF — malware analysis report

Static analysis result for SHA-256 f274429bb458d1e6…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 13:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e3139d703411aa5dd8417b8d71a848e SHA-1: 377c3f527269cc226b4dc46a17a2f61a4bc73ecf SHA-256: f274429bb458d1e6579da3e2f7b09faa13e72a8833d45309409dc2535042efb1
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://idd.no/ckfinder/userfiles/files/53503580321.pdf In PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/54308218058.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/19444bab3cabada9a3fc6137853bf045/43612444175.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/76700281472.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/45068221084.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/xavasiwelujugokositob.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/99982257583.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/41445709157.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/mabife.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109130301142684.pdfIn PDF document text
    • http://cx-gl.hu/images/files/27648739667.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/48492363096.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/50057367177.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/67593030371.pdfIn PDF document text
    • http://talesma.com/E/file/61825458346.pdfIn PDF document text
    • http://computerdoki.hu/user/file/muxanejibub.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161428b051a9a9---14446201428.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161337972e107b---99832322162.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/bulijevusojakimupigoge.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/vuwixidinalinudofeluriset.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/witejuwoxewuduvub.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/lelabi.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/guwonikuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fifa+19+apkPDF 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_off0000b24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24A 9872 bytes
SHA-256: d8517bfebf201370d99052fed980395928ae9f4906c1bedbcf418d76a92ff487
font_01_sfnt_off0000c821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC821 15592 bytes
SHA-256: 066ac1d2e1b3c631022cfbaafddc0e5567858c0bc4a579a33fb59495cb1f8d88
font_02_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1