Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f619e0b590752f6…

MALICIOUS

PDF

91.6 KB Created: 2021-09-02 05:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 091bb8d235605565c205665a1952d687 SHA-1: da3f6f2cd5cf1a1ce6d866f08ce5906cfdd23969 SHA-256: 4f619e0b590752f6ccb7e97198620238951bae42b126dda4f4a03b20ccfae654
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://gmkms.net/upfile_editor/2021/files/75347513121.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/70911378879.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/97321644979.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/g1tacic62c2uajec8g5r7oqje5/8936849277.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a1832005---monepufotas.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/ae2c9e2af0a651398f4478fd014c4689/zonikinadu.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/japepug.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210623230337_bccd54.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/23459792910.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/vawarejijexemakajipafip.pdfIn PDF document text
    • https://hirurgija.me//files/vojirejomexaredewo.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021061808510373499.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e363359b0a7---losaxiwaxabosunawivavat.pdfIn PDF document text
    • https://penal-garazh.ru/files/69154970677.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/275996df0d19a6547d03581e520ec621/lakesojenen.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/37616668317.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/17016841744.pdfIn PDF document text
    • https://bio86.net/fichiers/kanano.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46af4e484c---30775794482.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/tupupagamokobogoninapenas.pdfIn PDF document text
    • http://bwc.lt/i/limemamowo.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/89111440177.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610305b1beb68---26320307089.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/90412786158.pdfIn PDF document text
    • https://bdcomunicazione.it/file/72207543409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=goulash+with+fresh+tomatoesPDF 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_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 10600 bytes
SHA-256: bc1a2f6bbe15a4cf3ab9105de042725a568bde87b3346e0627f64e046ed3291c
font_02_sfnt_off0001283d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 21708 bytes
SHA-256: e810a713d999a15e0320940c7ddcef99eeb77918df152d6033d52f034fe34bd6

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