Malicious PDF — malware analysis report

Static analysis result for SHA-256 710c5fd51f944a4e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 15:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d5898b8beba24892381abd0ce8d935f SHA-1: 239ce72db567f8da3fdceebbb8662b095b774959 SHA-256: 710c5fd51f944a4eec2cefdde58b85fab575c42d640c2783fb5a5499e44a0330
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/49146011015.pdf In PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/wurukujivukim.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16090b6a7a9126---46468615037.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3444d4811702158cc08cf9e7928dbad1/59673436326.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/lnukknalkdr649jckpu3mpg035/konirogeveludisux.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f3ae64358---90959641294.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/8f5o3khmf2c4btsip48vsfcs68/1190395700.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/96a9b2c70e36a40ab7afab9e646b646d/64901421437.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/e922c804c0d1bc94a7627d7307ca3178/25342143376.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/porugilanuwinenivawudu.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/61487364631.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/83053663700.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/mitadanuvuzil.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/mcrov319lfqh81bf9q7tc2ssop/vopodore.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babd46af8ff---guganotebako.pdfIn PDF document text
    • https://bagstyle.uz/images/file/nosaxiru.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5377346d---11469130775.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210806134724.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021060907124773499.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb375cd66---sujiwajakokerexofokuxajov.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/zigipuluwevigidijapawovuk.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210828_A895B8449A30553D.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a729130be1---40353252178.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/tepunusuwatowozapotig.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/rugitisatajitulupaposad.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/db02e13ea51674a06a2082d7b72f99fa/53539215851.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/42991781498.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/bozutosewobudoluwisila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pelagra+pdf+2018PDF 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_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 10592 bytes
SHA-256: 065f6365b9c23c56332bfec6de0652a84e916107dfcb78b04eb916ad90de6720
font_01_sfnt_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 17100 bytes
SHA-256: 07d07d141fbc7f696ec8e942678e88011de7ecb9638182c52b4ea70ad53ad718
font_02_sfnt_off0001269b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1