Malicious PDF — malware analysis report

Static analysis result for SHA-256 146b9da96048927a…

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 13:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 45d3893c7709d50b17a8d976c06ca370 SHA-1: 192197cd236deb7bf9e569c9be8cfaea1843fd9e SHA-256: 146b9da96048927adcba3b7c18a76a40099a7c629c3cc458936ee3795172c761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farm heuristics indicates the file's primary purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://chcial.ru/uplcv?utm_term=the+grand+grimoire+full+book+pdf+free+download PDF link annotation
    • https://chetanaus.org/bheru/uploadfiles/file/24991230077.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/1a10887d65b51b7e0ae27e0ebcd16351/37391091529.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/52068163177.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/0550040f06597f8b0dc1ea662cf255d9/41804253281.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/bipob.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a15bb8eddc5---23319489864.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607af263781ba---xifizomimobax.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/seposidubisisir.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded68457dd---xojopebixemibidivagax.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b14a64e5e8---24035850400.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b88da6df68e---fanabasimalipawob.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ff0f670c2---lotinapexukoja.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/30c3ef1524f0b5f32e8c88657ea9dcad/83770011653.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd4a51c03---85031089819.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160919c9563989---dunukuzejajurevoz.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/immkuheo83limjr50vddufr021/tofajoretegu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7b01cce1d3a8bc37c0e09bb4bee312d5/61105388379.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be6e5410ee---vuzizegenonurofapen.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd5b9af91b---gorupani.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/5d8000e8ff7fbff360b22233d66f5743/66166598272.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/buxoxuxo.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607100ec8060f---35277076319.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160960c397017f---momoneweburog.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4fo82j6fu020etuesrdndorio3/20012251100.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/87029695382.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb7625682f---78639454308.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 17504 bytes
SHA-256: 114de5e44d43593a8da6d7c81952ed22da4a8cf4954d828a965381fea72e161b
font_01_sfnt_off0001248b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA2 11060 bytes
SHA-256: 5f61de4577cc111635350dfd3b72cf39a838130853c03b7825c909dfc4bc280a