Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fc1ffbd059186a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-01 19:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2c61964ecd07eaf1e1fdda00b1ee6d4 SHA-1: 4b63f29d536b513d82a60112184b0e05a1facec1 SHA-256: 99fc1ffbd059186affaaa8ee2e1b78db34d3347cd063ddf52d16140638bbab0d
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 as malicious. It contains numerous links pointing to compromised WordPress uploads and disposable hosting sites, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://infrive.ru/uplcv?utm_term=naacp+spingarn+medal PDF link annotation
    • https://beautyyaurient.com/editor_upload/file/lolafuxefafotipojov.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/24658298926.pdfIn PDF document text
    • https://lasanisports.com/files/7978934992.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/96707549415.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607498fee24d7---14335175109.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160901f119da38---gebuxojamuxiwoj.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/24461002466.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/65606939325.pdfIn PDF document text
    • http://praguetransfer.com/files/file/fubaloxijavujawe.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e000bcca7324815292d86509b5efebd5/dijejejotonejevuga.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/58126514901.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/30344621518.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/15872096905.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f68e474b74c---98018539742.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/furisideluvutomiferofuse.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/83847746906.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/431540712.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/filekurixo.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d1e2838ed8ce54e50940a40ac3497839/46230176370.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/0d6e28949ba8be9e5a6ca844e44ef573/99687352108.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/7803662367.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/2f7125b2eaf0efed50efd05aeb724760/paliwo.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/xonejojuxopa.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/21b6c68c8feea2a1f08263a74b27b0fd/xivolezal.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e6723427---83921153681.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210805_ADED31EBD9100741.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_off0000c39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39A 16496 bytes
SHA-256: 51e3612f18cea95250f5bcf94a65c489003e3dac5118e2e8c7b7860c96e96fa1
font_01_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 10616 bytes
SHA-256: d92943e8a57f843b741043836b1bc11a48a3a035a72ff4c03ef32f7f5eef2228
font_02_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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