Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbda25abe4e2d5d…

MALICIOUS

PDF

68.3 KB Created: 2021-10-01 05:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fda39887a66513a3bae5ac17e3bf91e4 SHA-1: 2e5f3bd71b16f0ed865e9a3c0736fde090659130 SHA-256: 0bbda25abe4e2d5d3908b4ea2bd566d852c3c88a2a488cd298a0ee5562c0ecbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and flagged by an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=i+am+love+streaming PDF link annotation
    • https://aprilboya.com/userfiles/file/43370390929.pdfIn PDF document text
    • http://midospa.com/upload/files/23610336339.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6f907044---79927788893.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/meferaxifufamug.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/muwurudeloxulinewawi.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/momodi.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/biwovejilegabaniliguze.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/rugalitafarirepeb.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/95133955325.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210924_204940.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/82020827085.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/95771f090e1ebd19e42e5f4343aa84b9/52580135999.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/19083529828.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1218ef9d11b253310b1844d32bd33842/79824575253.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/16983085247.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/debig.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/xejiwevaxetuwarapesibide.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/rawamafotosapifinukom.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/38782254542.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/dixavabunorojodoporizoxil.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/kalasikiwaxafejisaduvum.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/83562756073.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/xusadafetaruzelowirasofu.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/radotasaz.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_off0000af40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF40 10468 bytes
SHA-256: 23f05c1d018a286996a1f7ef1377161b2d7e0a968721d75947e23ff5ea7be9b6
font_01_sfnt_off0000c702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC702 14756 bytes
SHA-256: 7ee7a20364f14f4aa8b9d06c0a5518ee41b367ec0e28dcba2040c14c62d520f5
font_02_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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