Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aad85da4f1cb707…

MALICIOUS

PDF

77.8 KB Created: 2021-08-28 05:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 753e03bb8760131b10eccd9d7382109e SHA-1: c9ecddee1cf0496fea04e86258aecbb3631a598f SHA-256: 1aad85da4f1cb7073850c734f66a9aba67d540a119daf71962723df1a61da77d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicates maliciousness, and the PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains. These links likely serve as a link farm to redirect users to malicious content or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://mercuresamuichaweng.com/admin/file/munuwo.pdf In PDF document text
    • https://miraclechuppahs.com/userfiles/file/77192557086.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/a2b73df3dfe4e70feb421c93aba80e3b/pubefivodimasetu.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/tigonivogutok.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/b769bad397ea839bb5f7cf04d8e345a8/10001858542.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/lovuma.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/m47qgrs0o7brf5un4matv05bof/32822384871.pdfIn PDF document text
    • https://suncables.co/images/file/8686229841.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e79368cfbd---53584337022.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4cf313a9e---42059409015.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/losamoxebu.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/vadivolezarumari.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/47268351572.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/da4dc64a633cb52e9c4c8202332a1492/xidapegejep.pdfIn PDF document text
    • http://capri.lt/userfiles/files/zikodibademininanuja.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/bc17bso3m2vub845mnic0j6itc/4488385223.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/56031583526.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/12128909133.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b5730bf5f1e84bb84ddefdb8775672ff/ziwulepeze.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/bc6cc6c0d01d40b22a2d13a31f068d1e/xedibi.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/vexanitupumu.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/80884459834.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/423056187b7637ee3927ddf227602aa0/zokajaxediwu.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/fokuzupopukimalegira.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/98477830635.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/50867959111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dead+serious+meaningPDF 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_off0000ccbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 17312 bytes
SHA-256: 8a8436dc814c4a2df8b15739e0593b2ee08ded6f0513b65fb69115b425afd6a9
font_02_sfnt_off00011116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11116 10548 bytes
SHA-256: ab2ff8c765f1e2249b4213f3b9ddbe8f2371ea2df46ec3270e4220dd305f7c02