Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce316908cc60499…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 17:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96db040ea42cc08b186f8767839b9d21 SHA-1: 4532110e6b144384f46e194d88497194ff6ae0d4 SHA-256: fce316908cc604992066d8afca3543908801d2d9eef0d6bbb1d2db60e797684d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous embedded URLs pointing to potentially compromised websites or link farms, suggesting an intent to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=how+to+download+from+torrent+on+android PDF link annotation
    • http://www.de.ruben.pl/ckfinder/userfiles/files/12457429474.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358c2337719---jorovetefopumodep.pdfIn PDF document text
    • http://iucecb.com/files/file/7590383814.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/gugiv.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/zawosotazebumowibo.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/65296504454.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/zurebixotozopovumez.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/wekakemuw.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/zezikavokizatezakafe.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83817169872.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j5moe9j839f6sq1abuvkualpt3/pofazifozofagefemapotis.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/95751062615.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e45d7f3863---nuliti.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/30988246010.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614208fe4a91d---32249270139.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/wosejasimokatan.pdfIn PDF document text
    • http://domplus.su/userfiles/files/funuvibolofefifo.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/dawoximanowew.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/67361991132.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/5097309462.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138df149344d---3817492143.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a2f0c99a---kimosategifowukebobosebo.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/luvilekegafaguvipiv.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210905110506.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_off0000bad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD2 10424 bytes
SHA-256: 1bc3dced22928cd5328ceb5be4abf25d4704dd076bfbcd6606e4c3546cb99cad
font_01_sfnt_off0000d265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 16936 bytes
SHA-256: 3a1366b663949d3a9a1956242e95dcff6d5fe7d28256fe436fb30a4b4f9d0b74

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