Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fcb19478bc83a1…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 16:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72b0d5cc14da3adce22c255f936832e2 SHA-1: 64f31a55cd2327aef79bc4357c90cddaf42723eb SHA-256: 55fcb19478bc83a164a4abc986668142eaba755d71ac7fe96293e8f5d1d8d1c2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://helderlive.nl/ckfinder/userfiles/files/larejafatuvixera.pdf In PDF document text
    • http://full814.com/upload/files/15235840294.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/zodimu.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/33684952494.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161349703eb594---xepapusokonam.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/17230019953.pdfIn PDF document text
    • http://guchen.ru/d/files/kujenofogesaxitulunarite.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/82531503510.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b57b6af00a4592296255bd1abc63b949/zitisadamunogiwugaxap.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/64438142917.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/ribelujupopexidojixo.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/19570029326.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/vozapu.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/9567285869.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/80801657195.pdfIn PDF document text
    • https://edusfera.pl/upload/file/dabebimesivemegezavanuxor.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/76379252269.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/97903485989.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/nodojirinet.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/xulatasuwobobogafifejotis.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6118020b6---putajepinetifi.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/gividekug.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/80259003724.pdfIn PDF document text
    • http://apcmagon.com/userfiles/ripukoxetuwogufus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+10+vs+11PDF 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_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 10024 bytes
SHA-256: 8fe6d6838b5b10503c173d753f9d9b79ba6786e0dea2cba489eac1ba2d184830
font_01_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11739 17296 bytes
SHA-256: 5326ddfb1a25eb4bd7a936372f3cfcfb889a671181bbad8305e405ac6f18c283

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