Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f76fb5b09ad7e1…

MALICIOUS

PDF

109.2 KB Created: 2021-08-14 11:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7aa6fd5a6f357cc3e36217254e2d6fa2 SHA-1: cef4b20b66e94afa6bfdc7ae66e2819769a1ca34 SHA-256: f8f76fb5b09ad7e1dffb7fbf37288e0a952a98b4cbaba41e49281e467116ec0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the nature of the links and the PDF structure suggest it could be used to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://spy-military-labs.com/userfiles/file/buxiwebokoxemog.pdf In PDF document text
    • http://schodylux.pl/userfiles/file/65309640073.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ab10d88d9a1---saxemopeliso.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a56adfb023f---bozuwosizekifefuredo.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/69acb368a06a95119a6f922e44dcaa80/livepasejebeduvi.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5b25751a---tozokobevinegaje.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/dilinel.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/nivinepomot.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/1d913c1d62923e318eaf7db0709092c6/82755355865.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/milodaxukavolom.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607769b7eff63---tuxazeniduv.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/mokekafuga.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ad3d28cff---xanarazibawogasud.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/nanedumafufumobimulose.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/55343903861.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e675417d8a6dbbd32e3a60415ad954bc/dojirewiduravigo.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/85085951562.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/58915770610.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/cf350e54e4f943e7a2d1ab83509d936f/71190560443.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/15698642940.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/jelonomonigu.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609415668b417---fewiximikavovadizivolis.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/mubadisopixaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=does+isabella+die+in+the+promised+neverland+showPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B9 23496 bytes
SHA-256: 975bd128750215f9b68c809da0f0be8f3f0f456bb7c40d30f49793face927e72
font_01_sfnt_off000165e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DFB 10948 bytes
SHA-256: 50263312ac9a9f3f6cb4de09e4fa2374c875e7c2b5da53db0d9f465a2ba9f19e
font_03_sfnt_off000196f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196F0 3188 bytes
SHA-256: 0b213a61c40a51c1f6fd3a4c9c17538ad67a12df06e085e0653f9f7be8827920

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