Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b739bc62c10479…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 17:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ce3da00900ed8c7c88649281ea2d025d SHA-1: 0cc435c5a643823075b3dc7f88816d44a96a3ffd SHA-256: 72b739bc62c1047900e1892f07e43afc0c5863c4c727f599cda2edaa05634497
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, while 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' provide high confidence in its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=anime+movie+download+sites PDF link annotation
    • https://dalnoboy.com/data/filestorage/upload/files/xipabajatumapipe.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/48990450236.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pvo4r7hvur1gn6nk27jffhqip0/43709077566.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/327762f4002afdefbd5127b2e61f650d/57869731326.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e059752e1b---62957004928.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/69669557351.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/jobabadafedujepekizeju.pdfIn PDF document text
    • https://bursac.net/userfiles/file/2092323786.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/30828672733.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/924b130443803c25471d0543797dd43e/jibatokuvavivikurudavexu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857c8ecfc23---15371451676.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/31353384782.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/39689566168.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e9b655f29a95c941fab17b7319f35a25/91508802025.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e4ceee345e55ae21af1ad5e10cd25a8f/kuwixaxulixakupe.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/semaforazibevanezanupewa.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c8c05a8c4b1272aabc0c2f36dc08be9b/11844116269.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b2a028fc---mometuj.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/gepal.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/wovumewizoxizasanoduxoz.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/4igca45htdmu21vpd4huqfa8ii/runatewadig.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/35817874303.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074a06ca1c6a---98534210348.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/7637570575.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/kusozakamowojugar.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 10440 bytes
SHA-256: 002a6988f21eec505b164d2f6efcb169183ad68c968a775f01bf9080a52a1834
font_02_sfnt_off00012880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12880 17716 bytes
SHA-256: 72fb46e02d4edfd37e4e0b17078eea41888092f3c0b43c2c7b62045743c622c7

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