Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d2e7f07acc56a4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 21:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94774fa24fba4d13d2e2e30d5f348687 SHA-1: ab95cfd7dc6df7fab71245e65de9abb972ed6e7a SHA-256: b1d2e7f07acc56a428cb28d36cac3e395aa430da3cc259363f25c7769e3c87ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://icoachyou.biz/images/ckeditor/files/16459746235.pdf In PDF document text
    • http://rosniyom.com/userfiles/files/85759399435.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613381476b0fb---gakusij.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/90139825327.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/33605362073.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/zatarezixujidapef.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/79957835214.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/togavopirewozarogek.pdfIn PDF document text
    • http://slsnn.ru/content/files/kipefed.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/tiduvemorokow.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/24788546036.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613abff56d155---bivubuligazakajup.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/vedubukivuvodopipoxovuta.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/8abb3b3f4606c7f24e3678d886612576/98564894879.pdfIn PDF document text
    • http://bankerz.in/qpic/files/6767040355.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/tatisaliwinewabapiki.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/xuvetobokar.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347ec6c3b79---73378537407.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/81710384273.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/6738826826.pdfIn PDF document text
    • https://magerp.org/upload/files/jusopogakujagovol.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/90272551006.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161399c3a59631---rutukewidapagijoperajom.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109060500161797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=article+exercises+pdfPDF 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_off0000da0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 10312 bytes
SHA-256: 4c4247fb84e3fdc84484dc9479cdc300fd663b11a4182344a7e52362632fd84e
font_02_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 17488 bytes
SHA-256: 7cd04000045aba0eb456b4dc634e59110d620533c00c68b4da7dfbe8d14a4cec

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