Malicious PDF — malware analysis report

Static analysis result for SHA-256 1130abc6826ff081…

MALICIOUS

PDF

73.1 KB Created: 2021-10-05 21:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f5a10140e88e82664f8f15ae62acb1a4 SHA-1: 0f01c9653ff03968f4ee2133ea7d93369de2c211 SHA-256: 1130abc6826ff081d49109bbd2b744127e7024b5f41f8da610da2e3a933c22ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it's designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure points to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=convert+standard+form+to+general+form+calculator PDF link annotation
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/weritaboka.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/noromikil.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/3668940707.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba2648b7bb---pizutibagireneputeb.pdfIn PDF document text
    • https://clickbox.ro/images/file/tulilulowulumot.pdfIn PDF document text
    • https://mamalight.org/business_school/uploads/file/50241133478.pdfIn PDF document text
    • http://pololanna.com/user_img/files/71432449345.pdfIn PDF document text
    • http://ewtch.com/upload/files/20104191854.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/berezowabenola.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/79950871712.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/27162077889.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/bf984af5afa88391dcae1a3e15e3d607/sotupagafuke.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/36066063424.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ae5807bbde5c80873d45346b29b89493/gegelunopam.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/votevodaluwefupib.pdfIn PDF document text
    • http://3q1p.com/upload/file/210909171357408896spilmp13whvl.pdfIn PDF document text
    • http://njchemland.com/upload/files/43865727431.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/514367231.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/takadamabole.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/dazixemawuxolobosokufaw.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/susune.pdfIn PDF document text
    • http://parfumland.sk/upl/bepamadaw.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_off0000bcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF8 15712 bytes
SHA-256: 1e8c4ce29630fc865a8ee64fd231af8fe9cb5f7ed1a724666430381fadd50983
font_01_sfnt_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 10924 bytes
SHA-256: 405dc4d5ef178e2adc25f43bf5700d09b778213367b960dd083dd6b8eccd3550
font_02_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1