Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58051c6fe1faff3…

MALICIOUS

PDF

79.1 KB Created: 2021-08-28 15:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72cfd4aeccb52aaf4e92977a42010170 SHA-1: f747375a13a9e6a1800f20a738f8d8d5dbcd6c43 SHA-256: d58051c6fe1faff3fd7cbc2a564f492ca902f23245261061b78f196321db87f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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
  • 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://queure.ru/uplcv?utm_term=ross+marquand+avengers PDF link annotation
    • https://gemwares.com/userfiles/file/91598672080.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa520fc7c31---51669249573.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/delodafunuf.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/nusatanugevixovev.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5982b914d---natakofofiwe.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/11e9951fb47084826f218c678e6ffcce/66138421157.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/32007558828.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/12016400486.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/27061914823.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a31c9cac0---lagidubuxave.pdfIn PDF document text
    • https://0900107678.com/upload/file/womugulewesuwu.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/werud.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/vuvulokobu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01e38e0e73---90021114815.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/78671985229.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/1cbe1c5339b792b02f45e05d1bb8df00/42475888232.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160df274d40f79---7940839593.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/94auoog4qemj7eetf7ndnekuhr/zupovapawepo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f39244e44---6166173792.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ea6f57290d64e4d455282bed9d3151e0/litifonopepenis.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/848d646716c882e5fdf379d5a7f87877/pufesixisaponezu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/vunogetigusuginulawozes.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021072212485394.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822a32a2c32---27721918768.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_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 16632 bytes
SHA-256: edab47cb171462d3d6fcc0edc31ec5b1765dd73b6791f002c18ba4e83b0840b0
font_02_sfnt_off00011743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11743 10712 bytes
SHA-256: 0cd7615f57451952b5219769288394daedef00e3eb72024c8fd16c31c7ed9141