Malicious PDF — malware analysis report

Static analysis result for SHA-256 731d7a006e0db569…

MALICIOUS

PDF

104.4 KB Created: 2021-08-12 17:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c130dba705e5e1419327c344bb56b94f SHA-1: a707445a0737605a7ca51c7f618c00fa7a02b7dc SHA-256: 731d7a006e0db5696131519d6368c1b42b21d3cbedc84908f19a95cf2cb87481
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://chcial.ru/uplcv?utm_term=do+eno+hammocks+come+with+straps PDF link annotation
    • http://barcelonasixtytwo.com/userfiles/file/21005158551.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/54fdf03aca0e086366aec98cd5a86ca8/jonepomelorijujanufebu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4beb3843a---gubigijo.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/18062016621.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202142907356836.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160990d1162536---vawesudevulalexu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16102e63024229---bukamopitipopuwenoz.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/73592482771.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0eb0cb038---64850165880.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/baxigixede.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/paguwigabanenegajovozexas.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a46cf797d36---46547921784.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/92239032994.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q54u7rmut1lhkld3vfjojr8e0k/fewiwisurijapipina.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/laserabedofato.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/fufukusesuveja.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4bd2f60c---riwevix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6fd83d28---memusurof.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/piposipanu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fdfc02b97---24084959470.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/lupileku.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/39596028799.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/e9de3ac7d028be43720de962764ec3b4/15288428868.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_off00013431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C48 10772 bytes
SHA-256: 97de313dfaec6b12bee0e3e44fafd368fba91071d8d88877595a393ee14198a0
font_02_sfnt_off000164f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F6 17716 bytes
SHA-256: 8170a8d65ec17f820b7c74b697d2b711c98fd2e781795b77531397de6ae8f3ef

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