Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e457c7725007ce6…

MALICIOUS

PDF

79.2 KB Created: 2021-07-30 04:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87d902b5697d17ea1cf2392e5974a2e0 SHA-1: fc160adaee29353735d9d75a82aaa602dcd83b2f SHA-256: 5e457c7725007ce64f2c33512cb5bdc7e93390db8f003eb8f785662a3db24da9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/15bad20177bf5f105adc4d54754d9c05/48408961894.pdf In PDF document text
    • http://exmar.it/foto_fck/file/43449458871.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b92c6fdcd---76705128522.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5165fbd270---sepugijez.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/91e35a1a582fb84c159c55ad8b49b7d0/88760059964.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161024c2161458---xusurifajapomobemi.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095f1b70636a---57321463152.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608486251e0ff---27497707246.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/43564513352.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2156666fc09ec363534fa97a21f09a1e/jotadewukovefivuz.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/2c8d994232779cce341e403e08274238/22949090329.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e588963fd8---93901957815.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/604dc0016f9fa67f0213339c4f9f30e5/batosifupepatepibozed.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/vosibuguros.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/fazovife.pdfIn PDF document text
    • https://maisonforville.be/documents/file/pewosepifu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079de86903c3---mivofodigixetunofok.pdfIn PDF document text
    • https://airbays.com/userfiles/file/95680718651.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/76086251788.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/xoretonim.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/ridemezuduzoniximopuke.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16100178f23c2d---tuxirufiwesapogu.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/69783034100.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/larezebixoxemaxuvaf.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/durutinofugotupakezel.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/jq7efoam8m50tqbmvquq9mnh50/ridimawosikuwumogug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=%C3%A7anta+yay%C4%B1nlar%C4%B1+ak%C4%B1ll%C4%B1+defter+7.+s%C4%B1n%C4%B1f+t%C3%BCrk%C3%A7e+indirPDF 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_off0000cfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 11092 bytes
SHA-256: 02f9a9c9f84e70b9b37cdaf373e6b342a73b6afde0ff1f42ac26f08855c5dd20
font_02_sfnt_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 17248 bytes
SHA-256: 6e568df11166be45cd76772fd09741ff549dde7dac2f3895d298a0aa02010d88