Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f3e3bbc16225d5…

MALICIOUS

PDF

87.1 KB Created: 2021-09-19 06:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f1a1d566d8b78ab2b3f2423ac6fa282 SHA-1: 017f44dfaba9716c7fcbba3de3747957107f1dfa SHA-256: d8f3e3bbc16225d5da1619fe85b25bbdce86a531ecf83cdc82f1a1e176251e5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rdsdealers.com/ckfinder/userfiles/files/fifutefemo.pdf In PDF document text
    • http://posnlks.com/UserFiles/File/96049902387.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/53451190522.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/wakubamunefupazezegizur.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09671d99f---xinivoruwof.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/pobenokavizosuw.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/fegobabebogux.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/12304151014.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfee7beba7---61731752395.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f8bc95bc04cd3994f91403dd333c7187/8593887112.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/xobivobesanavuzoxuli.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/13750987822.pdfIn PDF document text
    • http://agmapure.com/upload/files/54337498108.pdfIn PDF document text
    • http://bushurov.ru/images/files/74281853792.pdfIn PDF document text
    • https://andana.us/files/files/36776728209.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/wetakosizimosuzaxezepa.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210917231315.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/68803005372.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109151841413721.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/80192062001.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/lh96hp8cpl95hv4h82onu3h12j/4860023217.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/82512995487.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/nanabosuro.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/gutolirivopanawezururemi.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/papuzotavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=spark+3+student%27s+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://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_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 10968 bytes
SHA-256: c35f9b016c123d69528d523d49fbcf71d227c3d8d822992ce45eb22ad4f98fde
font_01_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 21192 bytes
SHA-256: af44e8b844c3e88cafa77116be53028fdb3d793d15fd5ce72308926fe3c5a1aa
font_02_sfnt_off0001364b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1