Malicious PDF — malware analysis report

Static analysis result for SHA-256 09442430fb909742…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 10:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0c74b491a977203f7c6eac59c26c2a5 SHA-1: 68471b1d74cbed5baefdebe04615c763cce2c4ad SHA-256: 09442430fb9097428661436967248e79ee5967adbd8ea7c407991e7791131cf1
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting an attempt to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://francemonde.news/UserFiles/file/24434022062.pdf In PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/wipaguwujego.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/762da89daab654ac2cb82aa55d05fe69/38822612697.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1040da145a525226adb9cc1034c01d06/25177187211.pdfIn PDF document text
    • http://oilspecchem.com/files/livawimivinorifixipobi.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210917211223512.pdfIn PDF document text
    • https://olterus.net/contents/files/42701570333.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161366d70cd4ba---95850720648.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/44235227363.pdfIn PDF document text
    • http://ailizia.com/userfiles/82751702547.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/55951161973.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/44998608022.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/5127024819.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/lajijoxejamevamigipinur.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/fekabadipakofubebaledugu.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/91791604748.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/zuvet.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/76007786835.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c08a9bb6b---57536922278.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210913064359.pdfIn PDF document text
    • https://rcot.org/userfiles/file/52892429256.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/7032273857.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2172984e23665dbf5f7070fbbd3c96bd/23086678001.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/72753846133.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/xogodapinadularivud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=jeux+action+androidPDF 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_off0000e6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 10344 bytes
SHA-256: 7ec57a57ca7ec4166b24c2e62dda93cc6e4c77263e6277a62a4268f079ce75cb
font_01_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 19372 bytes
SHA-256: 5bf0e593a96c2934f546e523f4e5e1f6f474d23f8d615cb81e6d3232f40cb578

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