Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf0a8ab4fad4b5c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-22 22:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 682c72006cbd281cea7859967381bc7b SHA-1: 058e29f7d593f35b90294761cac9aed1ba1ed3f7 SHA-256: acf0a8ab4fad4b5c6e21eaea30138a20e14d27018f4a5fe95aacf108bddad0ad
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc3787022a1daba5c82415f4589e800b/wosivobusoratupadolebagi.pdf In PDF document text
    • http://kaupa.cz/userfiles/file/piraluloravus.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/16302903135.pdfIn PDF document text
    • http://attlas.center/userfiles/file/67766000892.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/pamanigiditikedun.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/revuzubimep.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/20854285650.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/jazegareju.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/tunagesabuturokaru.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/nenegujojusaleki.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/werezito.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bfec59593174bcdd4695791dd67de5e6/tebamibepusezito.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/rowuvebemumaxesen.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/mexasimajulanezekinobi.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/tamemujewero.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/47153595423.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/wibiwaxip.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/pidelolexexepuvaliver.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/kudifewulixup.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/74239367880.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397fee9f107---23280454398.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1b29607da---lufemobo.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/nutekizotigalulo.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/46063529911.pdfIn PDF document text
    • https://porfic.com/fotos/file/nabeniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=it+chapter+2+full+movie+download+in+tamil+dubbed+isaiminiPDF 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_off0000defe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 18420 bytes
SHA-256: 84008f14bd7aad91f7e4fb310b41f708dd94bdd4b20e831b60d8de129d4d4370
font_02_sfnt_off0001254b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254B 11348 bytes
SHA-256: 360257b1401a3db5aa6b0f31a7e07b5aaa57741473bbacd2c4987866db9eff83