Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4531c33815261ec…

MALICIOUS

PDF

95.6 KB Created: 2021-09-06 03:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50b093d32ac266f0649ed2d26eb0e98f SHA-1: fd44ac041ef9818ded693239ed7a1647ceebd48c SHA-256: f4531c33815261ecc60357970f5f9b2b3ff2590b4da8d4773692120f974ad6f3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm that redirects to other PDF files hosted on compromised CMS upload storage. The ML classifier strongly indicates malicious intent, likely to lure users into downloading further malicious content. No scripts were extracted, but the structure suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 5

  • 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://highendschmiede.de/highendfiles/file/davelopemosujadul.pdf In PDF document text
    • http://hjhchem.com/upload/files/25467295121.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/vizimelozuwunapakonofanut.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160fa3ee02c67f---zamapiberosexofe.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/jonapuvam.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/226c3b921734a2cb1d2b042dc445d8e8/24272309066.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/64152453970.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac69dc7113d---tonexabajazavusewubomu.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/wuboj.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b76c3b67c8f---lasaxezebijaduleki.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/l3ck3ek97rih88a744r93ljsp4/75038734583.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/18131855803.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/46769669411.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/vumefatigobuvanuxo.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ed1cb0a81fbe604a32fbda9d288fd250/46736222380.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc4ed2ffe---49334958604.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/48037407949.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7246b05a61---75272825183.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6cd757dc0---94923850686.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/89346149187.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/d9af6f6886185b6faa7961c021c23465/61973131451.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/tozewarisalu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8816b8aaaf158ab2a7da90fbb8a46c2d/3995714684.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae683d660---79389714347.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/84628410450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mervyn+peake+titus+groan+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_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001281b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281B 10992 bytes
SHA-256: c5f02682d91027b9d0b350f67a473ad15ea37bdbd494362fd27e6b8496441357
font_02_sfnt_off0001419e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419E 18168 bytes
SHA-256: 4b6afedc250d26eb52fca39ea6ca1bb9c75060e9b0434da39cc984d9d185ddbc

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