Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6189ef2a4345a6…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 10:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d7def2181117f019bdd21ff17011687 SHA-1: 66d030b9d137a0f4db9346c6ea8c977cf4d520f1 SHA-256: ba6189ef2a4345a620fee62e148042a85fb256e51f02e03e1af4c08d0c91030b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of multiple external URIs and link farm indicators strongly suggests the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://coretry.ru/uplcv?utm_term=my+keyboard+is+lagging+android PDF link annotation
    • http://kozszemle.hu/uploads/files/89291527565.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/xapefojixedujutesojogo.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/gupivememibuxupofabigisab.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a18e02422e---jexozazazumabilifuj.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/mepoxolukemif.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/365165353.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/15950841015.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/mimakerodapijal.pdfIn PDF document text
    • http://scro.ru/pic/file/vedixade.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/xuwere.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd88f61cd2---18483410711.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/mikanim.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/xisuxapivumuniliruk.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/xazemajurudanekatixotab.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/wifukojukiju.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/26987775039.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7c59dc100---19476491214.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/17660472217.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/95527595685.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/741c3a6f725497c397f96da13a073320/kigatoguwurebir.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/16535010155.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/10224710606.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/revigapilis.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/palamekubo.pdfIn PDF document text
    • http://z500.si/files/995172730.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/xuwex.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_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 18020 bytes
SHA-256: ac4ecf3979e06a3e08b5cd9f07504deea53c4c09db5ed8b284aeb6609bc0f530
font_02_sfnt_off00011a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 10664 bytes
SHA-256: 0e9b45f2bc13cb5a136a07b195f72fcfbe947e54e804dd35612bb83fbe3164a3