Malicious PDF — malware analysis report

Static analysis result for SHA-256 db16b7e1d694b9b5…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 09:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 81a541ef9a418bebaaea87dff06c5594 SHA-1: e9a902f1bcea67226ba608f874f0a353705ccb9a SHA-256: db16b7e1d694b9b52e1fa140d46cb31bedb2fd87f98cf230249aff310b1acef0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://valergences.fr/userfiles/file/fudamedasan.pdf In PDF document text
    • https://gallerylingard.com/uploads/file/fijateku.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/37772149362.pdfIn PDF document text
    • http://juncheng.tw/upload/files/zupoxomexenikedasufu.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109050233216324.pdfIn PDF document text
    • http://maidichike.com/upload/files/38513430557.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/mipapazebajizevof.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af32ea991d---10682823626.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/femudu.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/91029584101.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/45740889866.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/81130805144.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/kodedoporarew.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1523e5eb4---mapogituzowato.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/timilolur.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb69725a5---3602517877.pdfIn PDF document text
    • https://ewt.cz/res/file/84394691339.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/28857178393.pdfIn PDF document text
    • http://glttek.com/userfiles/file/fukijerejejegelivabobal.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7898c63b6---87081880707.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109031446292928.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/74430691763.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/49850031795.pdfIn PDF document text
    • http://esejsc.com/upload/files/41806618123.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/37034775972.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/bumabagomozik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=redmi+note+9+pro+headphone+volume+lowPDF 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_off0000b489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB489 17636 bytes
SHA-256: e70ac01305b2df6ca9d82ce48686870d99fd834ed97c75a32b78fe07b5b0bdb2
font_01_sfnt_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 10952 bytes
SHA-256: 8b1e783644f4401c99e96d3d2655df8aa7723fbf623126420e9d2ab1a21cf5d1
font_02_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1