Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f14fed5f6575d33…

MALICIOUS

PDF

85.8 KB Created: 2021-06-25 04:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4fa9fb09966c99d22782c094f5f15f1f SHA-1: ff848b28b50a23424cefb5596c543a563317f547 SHA-256: 1f14fed5f6575d330ba92b3ea13d26bcd0598e629c9345d57d7ebb0a9f48d611
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links to compromised websites and disposable hosting, disguised as an economics book PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. Although no scripts were directly extracted, the PDF structure and embedded links suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://e-fasteners.eu/media/file/ponugugaxarisipodi.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4092a7aa---dipaxafazenenubamow.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210624_22ED81E0FA791DE7.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/14156720271.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607814d54369e---73639035001.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/03d4399e5c5dd2d715a789d378b12e34/sadunepapujulidu.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/kejewazatuzeruxugetisax.pdfIn PDF document text
    • https://waroproject.com/file/15097886216.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/7808124483.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/56976269507.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a893633b165---rederuxano.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c57d1e65a---runasupojemoxivifowunikem.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d8d5587a9---39190759679.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=12+std+economics+book+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fd2e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFD2E 19160 bytes
SHA-256: 0fa31fc306d49f81ce954599bb6ccca3ddf8c5e8f2df73a6a1e04e919b59641f
font_00_sfnt_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 5256 bytes
SHA-256: 1d80a6dfc510f9621742e5cbcf8a7a62c67cf5f1bd1e7fea77d50f8013e90519
font_02_sfnt_off0001266a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266A 10512 bytes
SHA-256: a33f34b1131543a30b411fcba3fbffeaa59ce82f473f00e015314d3c7de818a5

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