Malicious PDF — malware analysis report

Static analysis result for SHA-256 533d3c3eba921f05…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 22:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 587d55bb23d20a74944e69a33e95c19b SHA-1: 196f571418031eebdaa4d8b65a32952f142cef51 SHA-256: 533d3c3eba921f05f4fb9dd0a95405536126c910ccde981404925d3789c300fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm that points to multiple distinct hosts, many of which appear to be compromised CMS uploads. The presence of these links suggests an attempt to lure users to external sites, potentially for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4aceccbad---segofowiliwo.pdf In PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a335ac67099---wuwurituga.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/jefizume.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/xatakugiduxubekesurugade.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/tkeklf9jpojk4segiebcca8ncq/senomuxenujab.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d49be504f2fd87d82c6ecbfe963f5baf/mekoxivaruxemewedi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f55fe1cabef---53027207709.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6b10d34902c27236bc612c197a55ba64/77676078647.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad661f98467---xumiv.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/59e259c7dd4b88c3df52850b28477444/metedekawutivivi.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11fb7f71a---widapudunaj.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a3fe05ab0---36740671121.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/vunidudukajafofo.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8fben12m4kpnjsokdpp16d7lf6/mulukupofovometilo.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/48984888102.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/bb7b6309db1e3862ae599c2cfe8789a7/69605415090.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/cf16b4f7afa221803b66c22a500da4f1/87552708788.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/pegunexirobibevegomago.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfc14ac6e8---dagazokeluxupu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160979e88c119d---dutelimewobubukokavufadeb.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210713_B92EC9A8E7232065.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/dabufav.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/54864704549.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/49a74124ba4494a38d879ec157693d70/kilexajubusisenulixozopi.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/96958898054.pdfIn PDF document text
    • http://mramus.com/fck/imagesfile/34154654613.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/pogojowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=downton+abbey+script+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_off0000c029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC029 16652 bytes
SHA-256: 56fea897c93af1e81b20acd89f3169bd962cfab1c7a70192fa4c6eb7b0533974
font_01_sfnt_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 11000 bytes
SHA-256: abab8f6e05d2c32564deae8f8dc6d797c1ea74b333c5a91c6050b4a49a5e9073

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