Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdf2c27b1172a91…

MALICIOUS

PDF

77.5 KB Created: 2021-08-02 12:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25c0155176ab1e98c41f094403dafd8a SHA-1: f5339d6e7a4d9ea3033aaeb98415563563dee893 SHA-256: 3bdf2c27b1172a9173bedb3ab598043bbdd18cc047e853b6962476f11f7175f6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm or phishing lure. The primary purpose appears to be directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=what+does+h%2Fc+stand+for PDF link annotation
    • http://hnspkjx.com/d/files/separogefifenoruzu.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/89254947915.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088a7924a42b---xetalebefugabikaf.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/kimanenivajitopinobar.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c857cba24db222c4512bd52efb2816ea/52723880764.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160714ee263ed8---40092381127.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/zadojif.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/27659951200.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/895378354897751b5677127cfeef8e9c/tenasorurar.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/78392605608.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ee2b67dbf16944c3e79260c5ca8e072e/55624168922.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/bs22p63qr5ugvln7f09cofk460/mimepefubobetizomujuwaris.pdfIn PDF document text
    • http://metapolar.hu/tmp/98935883609.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/96128081805.pdfIn PDF document text
    • http://ducnhua.com/upload/files/lovedij.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c535e8e2---pafulegigupujetag.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160941904d1487---wikinipoxojeda.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/37346732423.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/luvobuponoda.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b5ce95513---98782195888.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/2919d9b1d74f72eaceb26817c84a9e17/toledesadejenulomuf.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/ditolusaxinejel.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/cf3a4b3c6bff6698f1be5a9359a26eb7/fasubowibamomapud.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9s7l5a2ie0f6u87f0asdlg24sc/12045331794.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/33384039887.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_off0000cd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 16748 bytes
SHA-256: d24dd76fdda146737d5b8c2f3713969a64be923aef6d83f240eebd16f95177ca
font_02_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 10460 bytes
SHA-256: b0f666fcaeceb880ecbb71016d7e70551ed4b6b980f3a7487cdee406aefe824b

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