Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f59325feed91176…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 02:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e96807a581ef8f94643b040de7e44ea SHA-1: 1de457676e6349685b6d7636a401b6ace2234a16 SHA-256: 0f59325feed91176b2c6a62d6ec95c106c7dc53f066a9878b8488831f03ceba2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://itkaufmann.com/images/fckimages/file/berunopu.pdf In PDF document text
    • http://hzjksj.com/images/upload/File/kejudupodunagekewuwujuto.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f41e2cfb57---zijegirazemekevobi.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/84362522384.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/72283906958.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/58143780184.pdfIn PDF document text
    • https://freeunlock.com/uploads/file/58511369368.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/14606268761.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/50417253917.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/wetenunaguji.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/kubogafufinuzokefiwidudi.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/gesajasora.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/sumenudizikowuzesidazoga.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140745c37ad0---resebazetu.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/mopijetuxovilo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee2095dd8---fazejol.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/62878767057.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/wadujidevegokizisutepaxek.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/fagugaju.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/fefivid.pdfIn PDF document text
    • http://apex-architect.ru/images/file/49725713226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=boruto+episode+193+english+subPDF 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_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 24116 bytes
SHA-256: aa8526eaab49b242966d1acfb23b1f70d74c68382c13cf59ab22f00c00dce439
font_01_sfnt_off00011d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 11196 bytes
SHA-256: 740d50d1cc54502c1f3fc9cc9d22415ccdd38604f595e04f6aae4ebe475e6ec9
font_02_sfnt_off000136d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1