Malicious PDF — malware analysis report

Static analysis result for SHA-256 519de90f245783d2…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 19:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78e79577e7cf32bbd7faacc5d4902c53 SHA-1: 6f0ce5d0bb5bd3eaba455f5957fd44704bc5a5fc SHA-256: 519de90f245783d29cb0c700cf0a178d39487e4cd83095e59d90ee0ae1e2c372
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS uploads or disposable domains. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to potentially malicious content or phishing sites, aligning with the 'Spearphishing Attachment' technique. No scripts were extracted, but the overall structure and URL distribution point to a malicious downloader or phishing lure.

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://synerhu.ru/uplcv?utm_term=alpha+amylase+inhibitory+activity+pdf PDF link annotation
    • https://mirrorlink.com/public/files/files/zizufajaxidetedonujado.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/wozozumunag.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/63c311b4d201e6769e321afecfc482af/gedabidivunekijis.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ef90a20046---69408148704.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/lanedejadejakiju.pdfIn PDF document text
    • https://cape-electronics.com/media/file/79184612941.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/zumorafimajevuperoler.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/62762993397.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c0cfaf0f1e41e921bef1709698a88e13/sekamikalisokegorapetedem.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3d39c0715---52620361374.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/11538440618.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/fuwafunekamonujulodexo.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/53496743498.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/4f512e5106555331763dc5b960755eef/54644562016.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d637317de9---2153107224.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/fokubo.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/82722565678.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/memenexexominiriv.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/35163856919.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/vavaremomuzuzibotesix.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/nagujobip.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/45991349338.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/39653994093.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/tovazamopulogumovakez.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a718bcb13361f8bf89fb51c56ceb6553/96118123340.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_off0000c2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 16564 bytes
SHA-256: d5c1e76917a87a34a3a08754130a8a0a4da61c1cbbdae0e3277fd23e24dbe5c8
font_02_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 11184 bytes
SHA-256: 26abe5b9460d9d36b8dc326ff5b028d3b93ec875ca76bdb87132652506fa56dc

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