Malicious PDF — malware analysis report

Static analysis result for SHA-256 2939eb281e082d01…

MALICIOUS

PDF

93.7 KB Created: 2021-08-26 11:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b866bfb28aa4a290a991340464fa3c09 SHA-1: 7314d11660e1fe2be6d7de11db1495d2727cbd04 SHA-256: 2939eb281e082d01bc3db04ed47e60ad7cae57ceae923468436e2f3a9d8a4a0f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://allytemp.ru/uplcv?utm_term=take+me+down+the+road+i+believe+in PDF link annotation
    • http://www.klimavill.com//data/editorfile/fajisoralikap.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/tapukeromoguwasos.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f731ed56434---21147024943.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/xejajevosozo.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4c5c25021024c75341525ff2241d3338/71399882305.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/rajipuroxifiwubapotedunal.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/mejotetoz.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/kelimenizamuwuzax.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///rokebibuzewopuxozorebebul.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/45ce30c7630eeb574b489c4e897b9274/53055678976.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/140049453060a59798ae118.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ee8962749cfd0d320c8e67db435052ed/nuxasabefatapalovif.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/90829ad2e9317aefc2ac06e515d35f28/ratazififowobota.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/budubakirupugireb.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/rafobef.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///vadorixiginexoxawopew.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/vuwobiv.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/54561333715.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3dfec3a40---bijujakuxunafifosofum.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/01f3d56c5936a00adcf05a730452a56d/86262427797.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/617ad29b2bf01318d145592da6a25abb/96583407587.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/tesalefed.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/28e3248e995a96c3fe3443e3eed15f49/97712886335.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/12344698799.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_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 10692 bytes
SHA-256: 3ca8e1ee5dfcefa90ba711e8409483fb3fadf7f295dec1e5e9bc3527b9668a5f
font_01_sfnt_off0001203d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001384f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384F 18648 bytes
SHA-256: 73316cc0b86761a663c4425ee06206a4731c14f8b3c2348c93c3859c022ad055