Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3990521912b0852…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 20:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4cb6a5934b89981ef2c115be375d4bbb SHA-1: 77ac16e86baa38e35a8e88988b15eaf07849d9a6 SHA-256: a3990521912b08526183984b88e7f186a783190710a1c355009c6d9a4d3a837c
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the presence of numerous external URIs suggests an attempt to redirect the user to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://irlanc.ru/uplcv?utm_term=give+me+more+strength PDF link annotation
    • http://kxnjl.com/userfiles/files/vedowesewagupukejiliwetur.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/k9p5nlpdegc451soodvmirhck5/53554348379.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a155bb10060---jojinarazunepexumudixex.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160788fd821336---fulinaretikusevaxupulotub.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/27213962288.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/l4bn8e39utvocote1ie5ma1l25/96566183522.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/tuxowamirekosuxoxixaxolap.pdfIn PDF document text
    • https://shopabrang.com/images/files/kuwoni.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/warubisun.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/78f6624ecf84edc1af15bfdff85bce9a/sadinotiriruxirobuwatu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fcfab237b0606edbf4f7e22c40b9e3ac/86221296149.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/sixibujosezonesufakevod.pdfIn PDF document text
    • http://zuche0551.com/upload/file/36562619577.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/fuvimimage.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a749b378c17---natonomumisisavofavafixir.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/1545385990.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/kimoneminoxer.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/6355841873.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161253953ec447---jurufixovibevuruwawipibax.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/gositufopenipelibuxa.pdfIn PDF document text
    • https://goldenapp.net/file/tomowatimevufujalugusanog.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/tolef.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_off0000e9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 10452 bytes
SHA-256: e567d497801bef0e24238285bc2794b72a7264a3483c449a51df9d42b8416ae8
font_02_sfnt_off0001196f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196F 19704 bytes
SHA-256: e4b2caea1ac0ad2c1e7c096d5b27a4fa6c9adf9c382923e795280766687a60b0