Malicious PDF — malware analysis report

Static analysis result for SHA-256 5016ab5da12ce9f6…

MALICIOUS

PDF

232.4 KB Created: 2021-07-01 23:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8e1b883d92ba9ecd0f0c21a35f7837c0 SHA-1: b19f38dbad23fdef28d1618c54147443b993409f SHA-256: 5016ab5da12ce9f69bd394ab98031deb2eac1f1934de1575e11ffa39151acda9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to external URLs, identified as part of a phishing campaign. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically indicates an image lure linking to an SEO redirector for free-download phishing. The ML classifier and ClamAV detection further confirm its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=all+the+angels+sing+holy+are+you+lord PDF link annotation
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba66f5eb69b---28316399300.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097661f3e8da---19478335091.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b6a3fb6c---49700288685.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/342a1cc06e82217c702c84104a8856dd/85133195967.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7de7c84a3c00b3c37c2dd2141769120b/novejis.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/milawanive.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084b3e28f95b---7904318015.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e1abdc1e4b3b790f847ce634e389cba9/lipibafalexasofidivupej.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907a9ecc433---xelepis.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/zukulovonanowir.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075527dc27f3---goragibunalexamijibug.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/vatorevotegemuripowi.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210623015456_8wi57f.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b30619ec31c3c833279227996f835a4b/pinexilosixotaxaku.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c91d4377e6c---14782367674.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/23508720464.pdfIn PDF document text
    • https://bataretak.com/img/files/file/dimud.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/03/file/20210603_125152_159.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608328c581660---54644511754.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/u3nq86kqoe5cuf4apjqcvgnrkr/58735815545.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/81166914373.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00030540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30540 33888 bytes
SHA-256: dc938beb682ba7afd4710ac6f99322748a70ad9e708d654ac9fa6b8eed3015d9
font_01_sfnt_off000349df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x349DF 17004 bytes
SHA-256: 3bdd9b1efa6d000188f5ab1673a4a6c20eabc09f59b99783e6c650d1e01ee5ab
font_02_sfnt_off000362b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x362B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00037ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37AD0 10720 bytes
SHA-256: 6d67ace6917def01af25935b8fbb678cb275d51053aa18ef10b477fedf67820c

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