Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ddc6d7a6207f82…

MALICIOUS

PDF

67.8 KB Created: 2021-08-22 11:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5eb1ceffc0925220ce4097acb3f433a5 SHA-1: 31570b65d8426e5b134b3320396e8ebac624f235 SHA-256: 46ddc6d7a6207f82796c98112e6ed19ec45f4513ac9888837c1369362fcae521
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed that the PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites. This suggests the document's primary purpose is to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4355

Heuristics 5

  • 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
  • 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://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a97150f8d0---49794362493.pdf In PDF document text
    • https://uleiuri.ro/userfiles/file/nuvegakumimamujugofijuw.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/susilepi.pdfIn PDF document text
    • http://status.cz/UserFiles/File/60947988753.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609888f139b55---88392758374.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/zukeratexomisok.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/93186450522.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/60731552629.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/vizivujomemujunoxa.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/44723288647.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/33771092622.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/dudut.pdfIn PDF document text
    • http://htcable.cn/d/files/vobojunumusufopekesided.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/36434318102.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/eb156f49ff81cdb957516c9fac82747b/pikodonalawikez.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/28865945058.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/kejuxujuwezifoxuj.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j3rl7p7ttmk588ljs7na29u6id/vetatopexirupuxenagumi.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ifjqnjnvl72n9k2l25fgdk3deo/sevaruteju.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/aj9h3omfvka9k8pv3aqefvilmr/57608111307.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/jitarumogalatu.pdfIn PDF document text
    • http://jngf.cn/files/file/7152529603.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/zabose.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160871fe1638db---60200956558.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/niribazorepukepiver.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=spanish+past+tense+verbs+quizletPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC511 10816 bytes
SHA-256: bc72b9a723183561cb8d002f70b3baf532f164b737c14dff69f417a112d3d2fa
font_01_sfnt_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 16664 bytes
SHA-256: 4f6e061b05bdb0f1d8253ada7ea9aec4d9af93af49782f232ef7787d76fb66a7