Malicious PDF — malware analysis report

Static analysis result for SHA-256 51268fd10724cb0c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 12:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16cbc28ef286c79a7d27a81781f6c922 SHA-1: ab5d0c8a3e88e82c276bd77ab67422269bd00b7f SHA-256: 51268fd10724cb0c3d5cdecf5029484bef2df6864c8c6f917e1ade0b82a1004f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and 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. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://lawrenceyezersky.com/userfiles/file/logolebamomefurax.pdf In PDF document text
    • http://staractivecollection.com/resimler/site/files/pimetekalijaweziwegelalu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a3a92a0d3c0767334c89d5a696558bdc/31343776749.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0e21a3eca---36773043032.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/dd334d3d536b1f15a87b478c563b0de2/41063879773.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/18050380647.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/50406429515.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/tozawemisetofotidofi.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/zagijarik.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/rosezup.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/silekozosepiwozapamafexol.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/15844728470.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/61555547721.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a64a6c6ed---19409738786.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/rexisunito.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/62422167220.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/44026278350.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/1137382941.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/cb79ffb5bb04219b3ead69d09306938f/botosu.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48e57a507---pemimetovusapeximitalow.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/3402285392.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/28258692308.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/cce0f3dee4cd5d22849c3cacfa9e87db/16750841472.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/14048957816.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/1016476124.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611668ad9707a---80659183971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=game+of+thrones+series+torrentPDF 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_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 18044 bytes
SHA-256: b7c4512c1b38b2ea5e1530868964d34a5823e0a6774e0f54b3c990f695877fea
font_01_sfnt_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001326f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326F 10472 bytes
SHA-256: 3362cac4491a6ded69b664e4603e4ec7a8facc9e756088f2ff66e3abbde3db5a