Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4a47d4a6a268ed…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 20:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 851e8aad76845013dae72be9b500cd33 SHA-1: c73771a8bb13c0e30cd9844562365a5e2468beed SHA-256: db4a47d4a6a268ede98d5a92b0a7b8626438a38306963343602937b30ea70c89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing operations. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sinarwaja.com/account/files/39788495222.pdf In PDF document text
    • http://dataction.org/demo/dataction/media/20401042755.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/92065108654.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/mit78al9an7n887tssaclsnpqa/fewuduludiwoxera.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210907_5D3E66EBFFE6CE85.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/18947658391.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/17759236647.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/79470932307.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/musezisopuv.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/64876121442.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfd1fadbf2---lutukenidawabanarufusi.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/dojezew.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/51428800155.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/rojafanibejafawegipuwige.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/aqeq8jle5a91o4bi8ggccad814/nabofubetunuboxisab.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/73228400869.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/34013051375.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/xupojuri.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/96408606454.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/bobiposawamuvagijeropa.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/46408047622.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/95428827768.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/12693907732.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/19169328396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=just+eat+it+book+pdfPDF 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_off0000afda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F1 10564 bytes
SHA-256: fea961e9769f4957f90bc3e6252fc79c117919462da32844a6eac7fdd6be8bf2
font_02_sfnt_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 16112 bytes
SHA-256: b1f6ada459a77b059d93b596373feb8101d1f5187d7a093711ad199f4ca603cc

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