Malicious PDF — malware analysis report

Static analysis result for SHA-256 66630cd85cfc23f0…

MALICIOUS

PDF

183.4 KB Created: 2021-08-11 07:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 10e0bea9f2b26f51bf7579a52deb8004 SHA-1: 757ba77a79883984975f1d562a9783aaff528078 SHA-256: 66630cd85cfc23f0ab74fed0418737046aaa03bfb146821d882563020c0b4b9b
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, specifically as a phishing or trojan. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://mimpishio2.net/contents//files/79975471029.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984bf30938e---59210572672.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b39c18aae69b25e4ba3945ed65bba4c1/wonixupupab.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0c3aaf46---27201411115.pdfIn PDF document text
    • https://emmaushuis.org/pages/rafijixibodeleweruxi.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/895e3a24788c9dc7e6753720712ef421/7376730063.pdfIn PDF document text
    • http://baove24h.org/upload/files/mifusevigazuzokarujojatu.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9e534d38598c682cc9c3071a5e791fa8/93091953608.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/78383820756.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/zefewekupujaxodipobeveb.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/marulepazonojunanosazuz.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a411bdeabc6---ritikikopopepuxirunulifi.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/661c2a24a8815952c8b32c35c18c5f43/20830289076.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/melodekowibuwuvudun.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c20126565---ribajisigerujadevalepilox.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/194imc4mdubd4u83m9cqdlrto5/68870149655.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/xapuvimetogege.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/wopuvoxumokosabuxirok.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/roxupadamasorazazoda.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/nokal.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070204424373499.pdfIn PDF document text
    • http://apvn.info/userfiles/file/91794451744.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/58346693543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=administrative+management+5th+edition+pdf+free+downloadPDF link annotation
    • 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_off00026add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26ADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000282f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x282F4 11212 bytes
SHA-256: 7febc31add9b1e54e6e503d6a97e29530b21bbec32f38bf613967808c4ac8439
font_02_sfnt_off00029cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29CDF 18644 bytes
SHA-256: 9f2680cba79d8f2be3de677d68d9fa3b570aa65bebbf80f5be362a5c099c4a21