Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b62d49b4f6906c…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 20:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4aaad88389bf03ada5d22225da4588fe SHA-1: e480f94f7d19c8e25fccb16961d73aa8af02ee8c SHA-256: d7b62d49b4f6906c011a32d2e92102f37e5796ef3d313df6548c8d371aefe016
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the presence of numerous external links and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://chcial.ru/uplcv?utm_term=my+house+art+and+craft PDF link annotation
    • http://siciny.eu/userfiles/file/99271303377.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/77988264124.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcffed8cc4---34741191345.pdfIn PDF document text
    • https://rotitelor.com/contents/files/34727995446.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/45389858939.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/49651423123.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/4308625819.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/sukexepesixadidi.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/86198073604.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/4307576469.pdfIn PDF document text
    • http://briztravel.com/upload/files/95674182039.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/25158941445.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6d509e53d8277cc3a0c6a958c54f5ebe/tutegewuwenenirerew.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81986678158.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/76840223588.pdfIn PDF document text
    • https://umutfm.com/resimler/files/jabobuvefolizuniloluke.pdfIn PDF document text
    • http://gibisch.com/files/files/sizebezananuvolazoz.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/24996454264.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/10287079430.pdfIn PDF document text
    • https://fuoriscena.eu/file/1430525783.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/kizikinu.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/82560644745.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/77e66bd9961ecd172821c09146d1d4e5/dotajoj.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gepovuxevuzumewuvonatane.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/rivug2a0ca8c9mnl32q4q25va2/tegutixoler.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_off0000b1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F7 16484 bytes
SHA-256: b700c0e5b8eb8311403a96e2f82a55a2d6b329d2e97dc3f14afb0a4d598ba34f
font_01_sfnt_off0000dc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 10644 bytes
SHA-256: 907cef9f515abbbc748b1649cb652ca9b87c5a91f1a77dfb7b32a4fc2fa59220