Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8ecb129a46f311…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 07:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ee6c6886c0780c846ff6c6396cfeca5 SHA-1: 76f6322a61b618584f11d8bad82e5c44878442dd SHA-256: 2d8ecb129a46f311d91f575faab18de07b696e006e8011db88bdd7194c9bd5a7
96 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier strongly indicates maliciousness, and the presence of multiple PDF link farm heuristics suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://prtourusa.com/FileData/ckfinder/files/20210910_8D5767299822B86F.pdf In PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/75267131271.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5e975870e---suzigilalekoxala.pdfIn PDF document text
    • https://wrd13.com/force/file/didigirafabugupudej.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/vubemove.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/sosoxitod.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/penawutiw.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/kaselopaxoseno.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/72163563615.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/41735444816.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/81809424466.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210909200216121865cu5z455a3zy6.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/25052637470.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/tojelewedukugebajetik.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/xagexumesixefuga.pdfIn PDF document text
    • https://goodline.by/userfiles/file/govinejokenesawidil.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/mezoburipovekugalawiv.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/70237936815.pdfIn PDF document text
    • https://novitas.ro/files/mokozuv.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/68925494239.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130191430eb5---gakukube.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/jefopujomegonezozibisira.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/lpd0op435ctv6g17f9u0q7b83n/rulowibisidilevi.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/45621897541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=az+screen+recorder+how+to+usePDF 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_off0000e9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 10392 bytes
SHA-256: c95d2cbc94cc26c574e89ccb86528aac0f1d039607898a3361249744ef5ddd6d
font_01_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 18160 bytes
SHA-256: 057c86e94fe39ef9cc36c2f9c6336fe6b7476f3a2a406a3c18f7e1dafd553db4
font_02_sfnt_off0001306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1