Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5264067d3d216c…

MALICIOUS

PDF

84.3 KB Created: 2021-08-05 19:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65051a287911dd88609d2f4b3ee1eeb1 SHA-1: c524df5662d5b0b8ffa9bd0c002efdedd1ce1d03 SHA-256: 6f5264067d3d216cc30242514bbcb176f266b0e5d3ac9b048b9d8862c3c42389
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a link farm pointing to numerous compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93116bfbf---gawosubel.pdf
    • http://sochisushi.nl/survey/userfiles/files/21365231921.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b267f97d240---21772058319.pdf
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/rutolukusemanirimikupal.pdf
    • https://easypayindia.in/userfiles/file/39019025425.pdf
    • https://wfca-czech.cz/temp/userfiles/files/suduvalukuwegoladi.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rcjn5tf06ft0s6hhr8d5i6clc3/mepufufinidapudor.pdf
    • http://bukharaatlanta.com/sites/default/files/file/lawatatetusu.pdf
    • http://bluekeydigital.com/images/pic/file/61562170611.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f056d3379a---28874276606.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/43419085602.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/kho14p525n7e4e0dt18l4g7ss4/wozitupedipodewoxidimaja.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64a957b5c---83162652961.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086efdfc286e---barazoxexovitegat.pdf
    • https://deniz-sogutma.org/img/userfiles/file/62611007235.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4806f74683---30707199627.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/4db557f89a11bb608652550a2850ba0e/50085799297.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e7f2def3087c0ff0e1a03b0ad3f2a2ee/63888259411.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4d21a7cf33f356170c8c7c6c2b6d71d/dutofiju.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160f595c5b15f0---vovuvinukurexu.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b52d1ddfdb---lixarukunuzo.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/3goaadflvhhipegb39qkai1dp4/rizoxagovit.pdf
    • https://yourownadviser.com/ckfinder/userfiles/files/33915133605.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=actividades+para+segundo+grado+de+primaria+para+imprimir+gratis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 16792 bytes
font_01_sfnt_off0000fa0a.bin
16a8accb9caf557f13f01185e5937542f7fc9a7902583a7f4119d1a65f70e805
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 18028 bytes
font_02_sfnt_off00012783.bin
1125b4d0003362805bd251087b9c7c63b00d27d5622965d360c534652fd3ef9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12783 10960 bytes