Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25d1e6f33318aa7…

MALICIOUS

PDF

72.1 KB Created: 2021-07-09 18:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4832241ff3a37fd5135a86a6c2fdbf0f SHA-1: b9589a455e9d32a20a29d9e7c482b64bbbd8aade SHA-256: b25d1e6f33318aa76052364b7c16cbd9c2c1e4b7b50ef7685f486e5ae388b363
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the heuristic firings indicate an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7043

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 https://coretry.ru/uplcv?utm_term=scriptures+on+crucifying+the+flesh PDF link annotation
    • https://prokoncept.hu/admin/blogfck/image/file/dofel.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/33785851594.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b746776965f---wokazeji.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/sosezoxilemogoluxux.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/sk5l3a9jllkrnk8krunehvhn94/nivufulazitusuxuf.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30653b51c---jozitejebumake.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/mubud.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/8576380873.pdfIn PDF document text
    • http://ashioke.com/images/library/File/80549128906.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/52128419991.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/92812349885.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/906370c3e0f5a1a6f34938a58f3435f1/litufisajulozasojofater.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a770f1b049b---sexokinaxijagunakelogudiw.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ee289eabdc3a2536372f229bb89709dc/94895055906.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c984c6bf74e---35980162275.pdfIn PDF document text
    • https://bem-sa.com/img/file/538611981.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/p6dh2e1of0pn6t63se9nrrc53e/wokejejonozikoware.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba49dd814fd---negudazirifufinu.pdfIn PDF document text
    • http://modern-pro.ru/files/file/sudexag.pdfIn PDF document text
    • https://agatanorek.com/files/file/zasofofenuzif.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/24713856509.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/bojuvexisubuze.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/bilasawibutusazasezo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/79ac6640094fb160497620a6ac40258a/39003177613.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/svan25v6dksv4613purkh6fnck/weselufezesi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/361fd8c161aedfd2c837938add165503/61226247063.pdfIn PDF document text
    • 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_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 10888 bytes
SHA-256: f51b9575e6d93e930e2e091c3e19804f35068aa30e93c8a93959f6992bafec2e