Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3eba01d96c529c9…

MALICIOUS

PDF

94.6 KB Created: 2021-07-02 13:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7f089840a0a685a4b920f3911db5d507 SHA-1: ccd6127ee36e41d20ebbb501934d4344c33fd3d4 SHA-256: c3eba01d96c529c92d48bebdd422f4bbb2cbaa6a2095e1c868041389bf26c217
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://crysiq.ru/uplcv?utm_term=the+dreamers+dictionary+pdf PDF link annotation
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e45e69461862eb22633d29de1df878bf/77364760391.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/q36j5ahde4j1tr8ahhaj54nh1u/fedogamoxafu.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/jifamufite.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/63c8ec95771f6baf6d9d3aab4de82c50/vemanotedef.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a936807e739---43357885685.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607621fe6da53---56566907582.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8778af18dd---72253915543.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/47462364900.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/xetajamixalasafuruxokif.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3f1d4c07947e75f92764abe39aea1c35/45742820300.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3a88b53ee9435cafa5d9c6278265efc1/2595834761.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852d4a0847e---31117339341.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/8067321435.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a9669b14bd9---geriwubir.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/xedivotifafi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afe5900e26---17816239257.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/viguk.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/28710573967.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/88094606100.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/53b9d41ff97c06fbbfcc4e22cecbfc5e/vujivagawugeluligogo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mthhememjvsbvda7ngmikespi5/wurexesidutab.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/lejewexatemafopubifibo.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/dto1prog6rsdgh8s4i59sh8rd3/78412063728.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/29478914419.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe1190b298---zokob.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_off00010f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 17336 bytes
SHA-256: fadc2f348b5b49dd05b7724a182e5e8bf242b96ac67ad074b5db55c082b27f32
font_01_sfnt_off00013c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C11 10916 bytes
SHA-256: 8533fdb1d04c1f1ab3d55b3d27bd80de0a068a6509285314e7a2e388339908c2
font_02_sfnt_off00015539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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